From now a days
Smart people from UP and Bihar (like me)
Book their tickets for Diwali and Chatha Puja before 4 months, in night after 12:30 am from IRCTC...
For eg if you have to book ticket for 1 nov 2015 then book this ticket at 12:30 am tomorrow night....
Aur...
more... agent's b lag chuke h isme. :-P