Really friend this book - concepts of physics is very help full for your Eleventh Twelveth board Exams.It have so many typical and hard questions to solve or practice. It also very help full for you in competition exams like JEE MAIN, NEET, UPSEE and etc. It also gives best solution of NCERT book of physics and it also give last years questions of boards or competitions exam. It helps me a lot to preparing my board exams or competitions exam but its questions was very hard and very tricky to solve it, but once if you start solving its question then it will become easy or normal to solve it. It is expensive in cost but if you are planing for any competition then this is good for you.