Hi Ayush Jha,

At the time i used to study at resonance there was, i think PP1 the top one whereas the series began from AA1 till AA9 and after that AB1 begin now you can yourself understand how is your batch number

and in case it has changed you may check your time table that is provided to you on a printed half A4 sheet, the batches printed over there are serial order wise mostly so you will come to know it from there.