Update: If you are sitting for A-Level H2 Mathematics in 2016, your subject code is 9740.
If you are sitting for A-Level H2 Mathematics in 2017, your subject code is 9758. H2 Further Mathematics (subject code: 9649) is also offered with H2 Mathematics as a double Mathematics course.
To choose H2 Mathematics as one of your A-Level subjects, it is most likely you have learnt O-Level Additional Mathematics or similar syllabus like Integrated Mathematics for IP students.
Even SEAB (Singapore Examination Assessment Board) states in the syllabus content of H2 Mathematics (subject code: 9758), the assumed knowledge that a student must be familiar with from O-Level Additional Mathematics.
I will highly recommend students who think that you are not strong in the following topics to strengthen them during this holidays. By building a strong foundation in Additional Mathematics concepts will definitely benefit you in the learning of H2 Mathematics.
I write another blog for O-Level students on Additional & Elementary Mathematics at www.singaporeolevelmaths.com
The resources like questions discussion and videos explanations on the website can be helpful to you.