See Allen is a well known IIT JEE coaching center but the books published by Allen aren't enough for self study. If you take foundation classes at Allen then it can be a good instrumental. But if you wish to prepare by yourself as a foundation student then I would recommend Pearson will be the best. The book have a lot of practice problems as well as well described theories and application. So if you can solely follow it then you will get benefited.

I hope this answer helps. All the very best for your future endeavors!