Is there a report of income per month or per branch?

Yes. Klasku reports separate what was BILLED from what was COLLECTED, over a date range, and can be broken down per branch or per program — two figures often treated as one, when the distance between them is exactly that month's admin work.

There is also an arrears report per student, so the list of who to chase does not have to be assembled by hand. On the Pro plan, all of it can be exported to a spreadsheet file.