There are many books in the market and S .CHAND books are best among them .I am a tutor and I am giving tutions of physics, Chemistry and Maths upto 12 class I am using s chand books for physics and chemistry .These books are very helpful for tutors as well as students every topic is explained deeply and we can easily understand.These books covers extra topics in comparison to ncert books if students study with this books they can get very good marks.These books are very good for competative exams as they covers lots of topics related to competition exams.It is very difficult to get good percentage in intermediate examination students have to read lots of books as well as sample papers, but according to me only these books are sufficient no need to do extra books as these books have lots of exercises and topics that comes in exam.I am using physics and chemistry books for 9, 10, 11 and 12 class students since 4 years and students got good marks.There are very less printing mistakes in these books in comparison to other books so students should use these books for exams as well as competative exams.I really like these books very much, I request s chand publication to publish their sample papers also as it may help students a lot.