If you are looking to achieve a perfect score,you need to do rigorous preparations.And perfect score will be in your bucket.You should adhere the following tips

Refer good books such as HCV for conceptual understanding
Make your theory part clear, because you can solve numerical only when you have all your concepts clear.
Practice MCQs from books like HCV,DCP
Solve Past year paper
Revise formulas
Solve Numericals as much as you can.
Give Regular online mock tests
Cover all chapters basis on the High weightage and less weightage chapters to manage your time.

Thanks