I would say it is possible, but with Physics, maybe not. Physics is one of the subjects that i would say you need somebody helping you here and there, as if you do not understand one thing, you could be stuffed trying to learn other things.
I suppose it would be possible with subjects such as Geography / History / R.S. etc, as you can just learn and revise those subjects as such, however, with Physics, i would think it is too complex to study over a Summer period.