In the world of competitive academics, few feats are as daunting as mastering the Cambridge International syllabus. For one Wesley College student, however, mathematics isn't just a subject—it’s a language. Having recently been named 'Top in the World' for Mathematics and 'Best Across Three' in Sri Lanka, he represents a rare blend of focused discipline and creative passion. From the quiet halls of Wesley to the global stage, this is a journey defined by curiosity, the harmony of the piano, and a relentless pursuit of first-principles understanding.
The Daily Morning sat down with Sanuth Rashmitha to dive deep into his academic achievements.
Following are excerpts of the interview:
Tell us about your recent achievements and the gravity of these honours.
The academic landscape of the Cambridge International Examinations is notoriously rigorous, designed to filter for the most elite analytical minds in the world. Recently, I was deeply honoured to be recognised at the very pinnacle of this system, receiving two major accolades for my performance in the June 2025 AS Level series: The Cambridge ‘Top in the World – Mathematics’ award and the ‘Best Across Three – First Place in Sri Lanka’ award.
To put the ‘Top in the World’ award into perspective, it is not merely a high distinction. It is a mathematical census that identifies the single highest-scoring candidate globally. Mathematics is a universal language, and to be recognised as the top performer among hundreds of thousands of candidates from every continent is a surreal realisation. In Sri Lanka, such an achievement is historically rare. It serves as a testament to the fact that with the right guidance and a relentless work ethic, a student from our island can stand shoulder-to-shoulder with—and even surpass—the brightest minds from any global superpower.
The ‘Best Across Three’ award carries a different kind of weight. While the World Prize celebrates specialised mastery, this award recognises breadth and consistency. Achieving the highest combined marks in the country across three subjects requires a versatile intellect. It means being able to switch gears from the abstract proofs of Mathematics to the empirical laws of Physics and the logical structures of Computer Science without losing momentum. Receiving both awards simultaneously, especially after a period where such double wins have been scarce, made the experience profoundly meaningful. It wasn't just a personal victory; it felt like a milestone for my school and my community.
How did your journey begin at Wesley College, and how has the institution shaped your character?
My history with Wesley College is long and storied, beginning nearly a decade ago in 2015. Wesley College has never been just a school to me; it has been a crucible for character. The school provided a robust academic structure, but more importantly, it offered a culture of disciplined ambition. The teachers at Wesley don’t just deliver a curriculum; they act as mentors who challenge your boundaries. They recognised early on that I had a penchant for logic, and they gave me the space to explore that interest without making me feel like an outlier.
The environment at Wesley balances tradition with a forward-thinking approach to science and technology. This duality shaped my discipline—the ability to sit with a problem for hours—and my curiosity—the desire to know what lies beyond the next chapter. The "Wesley Spirit" is about resilience. It taught me that academic success is hollow if it isn’t backed by a sense of duty to one’s institution and a commitment to personal integrity.
Reflecting on your early days of schooling, were there signs of this mathematical prowess?
Looking back at my early primary and middle school years, I wouldn't say I was a prodigy in the stereotypical sense. My experience was very much that of a typical, diligent student.
I found that while some students were intimidated by the introduction of variables and abstract reasoning, I was energised by them. I began to realise that I didn't just like math; I valued the certainty of it. In a world of subjective opinions, a mathematical proof is an absolute truth. This discovery of logical thinking was the spark. Those early years were critical because they allowed me to build a normal foundation. I didn't rush into advanced concepts prematurely; I mastered the basics of arithmetic and geometry with a level of obsession that later made the advanced calculus of the A Levels feel like a natural progression rather than a daunting leap.
You have a deep passion for music and the piano. How does this hobby influence your scientific mind?
My relationship with the piano is perhaps the most vital component of my mental well-being. I have been a serious student of music since the 6th grade, focusing not just on performance, but on the intricate arts of composing and arranging. To the casual observer, music and mathematics might seem like opposites—one being emotional and the other being cold and calculated. To me, they are two sides of the same coin.
Mathematics is the study of patterns, and music is the auditory manifestation of those patterns. When I am arranging a piece of music, I am essentially solving a complex multi-variable equation. I am looking for harmony, balance, and structural integrity. The works of Bach, for instance, are essentially mathematical masterpieces. Playing the piano provides me with a form of active relaxation. It allows the analytical side of my brain to rest while the creative side takes over, yet both sides are speaking the same language of logic.
Furthermore, exploring Computer Science and Physics beyond the syllabus is another hobby of mine. I don't see coding as work; I see it as a sandbox where I can build worlds. Whether I’m working on a small automation script or researching a niche concept in quantum mechanics, these activities keep me mentally refreshed. They remind me that the world is a giant puzzle waiting to be decoded.
While you aren't currently in competitive sports, how have your past athletic experiences contributed to your academic stamina?
At this stage of my A Levels, my schedule is dominated by laboratory work, further mathematics research, and society commitments. Consequently, I am not actively involved in competitive sports. However, the athlete's mind-set is something I carry with me into every examination hall.
When I was 11, I played badminton, a game of extreme precision and lightning-fast decision-making. At 14, I moved into cricket, which is a lesson in patience and strategy—knowing when to defend and when to strike. My time in the school swimming team between the ages of 8 and 10 was perhaps the most physically demanding, teaching me the importance of breath control and steady, repetitive effort.
These sports taught me that excellence is a habit, not an act. Sports gave me the grit that allows me to stay focused during a three-hour exam when the mental fatigue starts to set in.
How do you manage the balancing act of such a high-pressure academic and extracurricular life?
The concept of balance is often misunderstood as spending equal time on everything. In reality, for a student at this level, balance is about rhythmic intensity. There are seasons for intense study and seasons for extracurricular expansion.
I manage my commitments—which now include the ICT Society, Science Union, Math Union, and Quiz Club—by adhering to a strict, self-imposed structure. I am a firm believer in the ‘Deep Work’ philosophy. When I study, I am 100% focused; there are no distractions. This efficiency allows me to buy back time for my other interests.
Joining societies like the Math and Science Unions isn't an extra burden; it’s a way to contextualise what I learn. When I help organise a school event or participate in a quiz, I am applying my knowledge in a social and practical way. It prevents tunnel vision. My involvement in music and school clubs serves as a safety valve. If I feel the pressure of the upcoming A Levels becoming too intense, I can pivot to a coding project or a piano composition. This variety keeps my mind agile and prevents the burnout that so often affects high-achieving students.
Can you take us inside the moment you won the ‘World Prize’? What was the emotional and psychological impact?
The moment I received the news was one of those rare instances where time seems to freeze. To be told you are ‘Top in the World’ is a staggering thing to process. My initial reaction was a mix of shock and a quiet, profound sense of relief. It was the validation of thousands of hours of work that no one else saw—the late nights spent wrestling with complex proofs and the early mornings spent reviewing past papers.
Psychologically, the award changed my perspective on potential. It destroyed any glass ceiling I might have subconsciously placed on myself. It taught me that ‘World Class’ is not a status reserved for people in other countries; it is a standard that anyone can reach if they are willing to be honest about their weaknesses and relentless in their pursuit of understanding.
The reward wasn't just the certificate; it was the realisation that I had developed a level of mental mastery over a subject that is often considered the most difficult in the world. It gave me a sense of responsibility. I now feel a duty to use this aptitude for something that goes beyond just getting high marks—I want to see how this mathematical foundation can eventually contribute to solving real-world problems in technology and science.
Who are the architects of your success? Who helped build the person we see today?
No achievement of this magnitude happens in a vacuum. My parents have been the absolute foundation of my journey. They provided the most important thing a student can have: a stable, encouraging environment. They never demanded the ‘World Prizes’; they only asked that I do my best and remain curious. That lack of external pressure allowed me to develop an internal drive that was much more powerful.
My educators have been equally instrumental. My teachers at Wesley College and my private Cambridge tutors didn't just provide information; they provided perspective. They were willing to go off-script and discuss high-level concepts that weren't even on the exam, simply because they knew I was interested. They treated me like a scholar rather than just a student.
Finally, there is the role of self-determination. You can have the best teachers and the most supportive parents, but you are the only one who can sit in that chair and do the thinking. My success is a result of a partnership between my support system and my own willingness to put in the gruelling hours of intellectual labour.
What is your underlying philosophy or secret to mastering complex subjects?
If there is a secret, it lies in the shift from memorisation to intuition. Most students approach education as a task of gathering facts. I approach it as a task of building models. When I study a concept in Physics or further Mathematics, I don't just want to know the formula; I want to know why the formula has to be that way. I try to derive things from first principles. If you understand the why, the how becomes obvious. This makes the information stick because it’s no longer a random fact—it’s a logical necessity.
I also practice consistency over intensity. I would rather study for two focused hours every single day than ten hours once a week. This steady drip approach allows the brain to process and encode information during rest periods. Finally, I maintain a growth mind-set. If I get a problem wrong, I don't see it as a failure; I see it as a data point. It’s a signal that there is a gap in my logic, and closing that gap is where the real learning happens.
What is your message to the next generation of students who look up to your achievements?
To the younger students, my message is simple: Fall in love with the process, not the prize. If you are only working for the ‘World Prize,’ you will find the journey miserable. But if you fall in love with the beauty of a solved equation or the elegance of a clean piece of code, the prizes will come as a natural consequence of your passion.
Don't be afraid to be the person who cares too much about their studies. In a culture that sometimes celebrates effortless brilliance, I want to celebrate deliberate effort. It is okay to work hard. It is okay to be obsessed with a subject. At the same time, don't let your marks define your soul. You are more than a GPA or a Cambridge certificate.
Engage with the world. Play an instrument, join a club, and talk to people who disagree with you. A great educational journey isn't just about filling your head with knowledge; it's about expanding your capacity to think, to feel, and to contribute. The world doesn't just need people who are ‘Top in Mathematics’; it needs people who can use that mathematics to make the world a more logical, efficient, and compassionate place.
The views and opinions expressed in this column are those of the interviewee, and do not necessarily reflect those of this publication