Dear shashank
for board exam NCERT books are more than enough.you should study NCERT boks line by line.then you can get more benifit from NCERT books.
questions in HC VERMA are for the comptitive xeams.generally those types of question is not asked inn board exam.So H C VERMA will help you to clear the concept but it will not help in terms of getting more marks in board exam.
if you are prepearing for board as well as for comtative exams then must follow HC VERMA ,otherwise no need to study HC VERMA.
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Badiuddin