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The basic purpose of this book is that student can learn concepts in less period of time. It contains lots of MCQs for your practice. To score good marks in your exam it is very important that your concepts are clear.
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this book focus important topic only which come more in jee exam and question that prepare you in this exam.
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the most accepted crash course programme for the students who are preparing Join Entrance Test.

A key point to understand is that-
Exam Output = (Your knowledge) x (Your Exam Efficiency)

Knowledge refers to having a strong understanding of the syllabus for the exam. While, efficiency refers to translating that understanding into scores. For those people who cant score well in exams, either their knowledge is lacking or their efficiency is too low. Its also very common to find people who lack both of them.
this book fullfill all your problem.