These are IIt jam preparation books for chemistry from Chem Academy. This contains all the 10 booklets including one booklet of PYQs. It has detailed notes of all the chapters and have lots of practice questions at the end of each chapter with solutions. This is all you need for the preparation of IIT Jam chemistry. 5 books have a stain on its side. But the inside is still fresh and free of stain ( one with the worst staining is organic part 1 and its inside picture is shown for reference). if you buy this from Chem Academy you'll have to pay 5500/- minimum.