yesss thanks for answer i am preparing for iit jee bt what questions should i solve means which is the most important part of exercise questions i should solve???

Akanksha You should try to specify your question. It depends on how much you are prepared in the topic. If your basics are clear then try to solve the harder problems in the exercise. If you are weak in some topics then you should solve all the questions in the exercise. That would save time and also your concepts will get improved. And also parallely solve problems of dc pandey or BM sharma book. Those are very good and helpful books.

Akanksha nice question