Here are the things I can teach you:
1) Thinking out of the box (track record of innovation in many scientific topics)
2) Training for speed and precision in calculations (button mashing on calculator)
3) Linking topics together to solve difficult problems (experience in doing multiphysics work involving different equations and solving techniques)
4) Study smart for every subject (simplify subjects, only quick revision required)
5) Examination techniques to overcome obstacles. (derived equations and concepts that were not taught in exam environment)

If you really need help, find me here:
https://www.carousell.sg/p/free-trial-class-a-and-e-maths-tuition-o-levels-1297230363/?t-id=pzulG52hv__1712522569682&t-referrer_browse_type=search_results&t-referrer_context=category_slp&t-referrer_request_id=ARSbh3tFrCjM9ZVH&t-referrer_search_query=math%20tuition&t-referrer_source=search_landing&t-tap_index=12