Hi aspirant,

In order to participate in JoSAA counselling, a candidate has to register himself/herself first. After this the candidate fills choices and make his/her preference order of colleges and branches based on obtained rank and interest. Mock allocation is done then to let candidate know what he/she can get within the preference order made. After knowing which college and branches the candidate is getting in mock allocation, he/she can then re-arrange the choices to ensure getting the best possible option. Once choices locked cannot be altered. On the other hand , third round counselling is the real allocation of seat.

Hope it helps you.