I would suggest you to know the concepts behind Physics. In HC Verma's book there are lot of questions to practice which helps student make concepts stronger. 

Sometimes during exams some students who have studied whole chapters tend to make some silly mistakes. To avoid making silly mistakes I would suggest you to practice previous years papers too and also to give mock tests.

Sometimes time also becomes a issue which then leads to incomplete paper. So see how much time it requires to solve whole physics section by giving mock tests. 

How much marks would a student score? Well that cannot be predicted. 

If you still have any queries feel free to ask in the comment section down below.