Without drying to dampen your enthusiasm I think it is a tall order.
University isn't all getting pissed up etc, and you will need to write essays etc and I think it would be very hard to slave over course books writing essays and then to slave over ATPL books. One of the academic disciplines might suffer. Also an important part of University is socialising and having fun. If you are in halls for your first year, you will find that you have very little spare time!!, people always inviting you out for drinks etc
Theoretically it is possible, no doubt about that but don't jeapordise the enjoyment of attending University. One skill that University does provide, is the ability to take good notes and to work on your own accord. There will be time to do ATPL's after University.
Best of luck, there is no harm in trying to do ATPL's at University but if it gets too much, don't make yourself miserable.
Sagey