It is always preferable to complete all of the chapter assignments because they provide valuable practice. Math is a subject that can’t be practiced simply by reading or memorising. It needs a lot of effort and practice. After each section of the NCERT textbook, there are examples and activities. After you've finished with each lesson, go through the solved examples and ensure you understand them properly. Then go over the exercises and see if you can solve them. There is a potential that identical questions will appear on the exam, so students should thoroughly practise the sums in the exercises.