Hey Aspirant, Aiims is really a challenging paper more than NEET and JIPMER so in this you need to study more often. Having only the module of allen would not work rather you must set a target to complete most of the modules of Aakash, allen, sri chaitaniya, target pmt and many more. You must devote minimum 15 hours in a day just for the sake of studies and at that tome you should just study no external work.

Hope this helps

Good luck