MS Excel work

Description of excel work: Hi, I have an excel spreadsheet to use for my accounts. It's divided into a page per month, but the calculations it's supposed to perform don't fully work (ie it doesn't carry forward information after a certain point unless you manually carry it forward, and then later on it stops doing any calculations altogether!)

It just needs to be made functional please!
Thanks
Extra notes: Problems I've noted so far:

Running total doesn't carry forward from Dec to Jan, but if you manually enter balance, it DOES then continue the calculations (ie doesn't populate columns marked: Total In, Total Out and Bank Balance)

Nothing carries forward from March to April, and no calculations are performed.

The Balance Sheet Page and the Reconcilliation Page also seem to be - erm, broken?

(PS My financial year runs Sep to Aug, so the pages can't be re-arranged from how they are now).