If you are preparing for medical or iit exam than go for allen it is a very good platform. Precious year allen gives top 3 ranks in medical and since last srven years allen has its top 100 air every year . I was the student there myself. I cant describe how wonderfull the institute is and how different it is from other coaching classes in the country. Every single teacher there has to go through a very difficult screening process while joining so there is no doubt of there abilities. So its a good plateform for future doctor and engg. must go for it.