What are my chances?

I am a Chinese student currently study in a local polytechnic in Singapore. I know it is out of match as compare to some local Junior Colleges such as Hwa Chong Institution and Raffles Institution, and my GPA is also not very good(only about 3+ something). However, I’ll represent Singapore for a international competition recently in Frence and have a holistic record in my portfolio(student leader, play in school concert band and local community band). In addition, I scored 156 for Mensa test and was accepted recently(4 points less than Einsten, Hawking and Gates).
Ps: Our school do have some students been accepted by Harvard, Yale, Imperial College London and more to local u(NTU, NUS ect.)
Any suggestions to my future path?

Today at 12:17 pm edited January 24
I would not like to consider US universitys which have world ranking less than 20(since NTU is ranked 30th+ and NUS 23th and some good Australia Uni I can choose easily (world ranking above 30th plus).

And I want to pursue a degree in theoretical physics despite the fact that I’m studying an engineering diploma currently.(I started to read Stephen Hawing’s books since primary school and always kept that passion. I guess I’m not suitable for a future related to or solely on engineering so that’s why I can’t do it well).
Some not so important stuff to mention: I’m not really a nerd. I play several sports and musical instruments)

Oh and I do need financial aids.

National competition gold medalist at secondary one in China.
Scholarship received every year during secondary school.
Student role model every year during secondary school.