I am an high school student starting grade 11 this year . I have been intrested in physics since class 6 and i have been studying advanced physics since then . IN grade 9 and 10 i have read and solved problems from Resnick,halliday and walker's book ( which i think is a undergrad book isnt it? ) and i completed it . I learnt calculus( integration , differentiation and solving simple differential equations and nothing more) , trigonometry , higher algebra and geometry side by side with physics . Now I am in confusion about how to proceed from here . Should i strengthen my problem solving skills and go for the international physics olympiad ( if yes how to prepare for it) or should i continue studying advanced undergrad physics books( if yes , please suggest any good books ) Any guidance would be really helpful.