It is WAY more confined than VCE, if you think having English as a compulsory subject is bad enough, in China, Chinese, Mathematics and English are all compulsory. Also from what my parents have told me, there are subjects which you MUST study even if you don't get examined them on in "Gao Kao" (basically the Chinese equivalent of VCAA exams), these include Chinese history, literature etc. VCE is much less constrained than the Chinese secondary education system, you can pick subjects to your own liking and whatever suits your taste (except for the compulsory subject English). In China you don't get this freedom, your education is already set out for you, the majority of all the subjects you do are all compulsory, so if you are bad at those subjects then bad luck.
In other words, unless you go to a technical school, ie, a specialised school for sports, music or whatever, you will be doing the EXACT same subjects as the rest of all the secondary school kids. So if mathematics ain't your strong point you have no choice but to get beaten by many other students.