Your query has already been answered. Though let me put some more light on it. Every month, the lowest amount you maintain will be taken into consideration. So if you deposit 400k in your account on 1st February but withdraw 300k in any form, be it cash withdrawn (least recommended), payment to third party (online or via cheque) or utility payments/purchases, only 100k will be considered as your balance for the month. It doesn't go like the minimum balance concept of the bank where if minimum balance required is 10k and you maintain it anyhow in a month, they won't mind you keeping only 5k on a given day in the month. Hence, for you to show 400k, you need to maintain this balance through out. Now, when you prepare your bank statement, ensure you do not deposit 400k all of sudden. There should be trend and if you can attach source of funds then nothing better than that. Another option for you to do is, you need not maintain such a balance in your account, just have a decent amount of 50 to 100k in your account and go for Fixed Deposit (FD should be at least 6 months old). But what I wonder is, if you are from India, then why you have to worry at all about all this, simply pay tuition fee out of your own funds and purchase GIC, that's it. Isn't it simple. On top of that, you need to only show ITR of your parents/urself (if you applying under general category) and if you are applying under SPP, you don't have to do anything at all except pay tuition fee and purchase GIC, no ITR, No Bank Statement, no property papers, nothing at all (yeah of course educational docs, medical, passport etc).
Cheers!