every one from SM2 has done that kind of exam before, no one died on that...
if you really want to shorten your bridging course and enter the university earlier, you'll need to do some preparation on english... at least can solve highschool math and physics in english... you should learned integration and differentiation right? i think the exam won't be more than that...
if you do not want to prepare, it is ok if you fail in the exam and do the 20-month bridging course. actually most people take that. so don't worry...
spend more time with your friends and family ba~~~
:)