Here are some reasons why you might want to choose to take additional mathematics at ‘O’ levels:
(i) A pass in additional mathematics is a prerequisite for studying H2 math or H2 further math at JC. If you are keen on pursuing higher education in medicine, science, or engineering, then it is highly advisable to take additional mathematics as most institutes of higher learning, including universities such NUS or NTU, always list a pass in H2 math as one of the entry criteria to these courses. You would therefore need to take additional mathematics at ‘O’ level in order to qualify for H2 math at JC, so that you can later do go for those courses in your post-secondary or post-JC education.
(ii) Knowledge and skills gained in additional mathematics would be of great help to you in tackling ‘O’ level Mathematics (Syllabus 4048). In additional mathematics, you are exposed to harder problems and acquire a deeper skill set that is highly transferable to ‘O’ level Mathematics.
Do not be daunted simply because additional mathematics sounds like it will be a lot harder than ‘O’ level Mathematics. You have two years to train yourself in the subject and in the hands of good teachers and math tutors, there is no reason why you won’t do well.