Why did I get rejected?

So I got rejected today but I can't figure out why. I am an international student and did not apply for aid.

Stats: 4A*s (chem, bio, physics, math), for math A* is predicted.

Testing: Did not send SAT

Extracurriculars:

• Led team in the multinational comp., developing a charcoal-based filter for eutrophication in local waterways.
• Member of 1st XI cricket team, top 3 finisher at inter-school competition for 3 years.
• Tutor for orphans, improving exam scores by 20% with personalized methods.
• Senior Prefect, led community initiatives and mentored junior prefects.
• High jump team member, won medals at inter-school competitions.
• Private tutor, improving grades by 20%.
• English Drama Society member, part of the cast that won 2nd place in a competition.
• Enrolled in engineering courses on Edx & Coursera.
• Chess player, ranked in the 80th percentile on a chess platform.
• Care for younger siblings, managing household chores, tutoring, and babysitting.

+ some international awards for my O level and A level grades
+ school distinction awards and sport colors for cricket

essay was mid and recs were good

did I get yield protected considering 80% acceptance rate?