Well..u can read pritesh singh mcq book..last 4 years paper..but dont completely depend on it..
Use it as a tool to dig out important topics which are mostly Repeated(mind it im saying topics not questions).
There is little tendency of questions being repeated(mostly) but a greater trajectory of the topics are being repeated..
Do not rely on the explaination blindly..read the topics in n out from a good source..might be coaching notes or a standard textbook..
Aiims also has a tendency to ask a lot from your routine internship work..so if u r an intern keep an eye on the practical experiences..a book cannot ever get u that.