I have purchased Arihant gate 17 year previous gate for mechanical book but after purchase I got really disappointed . Its does not contain explain of all the tough problem . Also there are miss print too . Low page quality. I regret so much thay I have brought that book also question are giving in decreasing order of 2017-2000 . When preparing for gate all want to question arrange topic wise not previously year wise become very tough for searching partical question for solve . After that I returned that book to seller and recommend NOT to buy this othrr wise you will get frustrated