While I do understand how you feel, I felt the same way in Y11, the whole "doing fewer subjects" thing at A Level is a bit of a trick really. Although you're only picking a few subjects, the modules within those subjects are usually different enough to make them feel like complete different things. So if you think you'll have less to revise then unfortunately not.
Also, I was looking forward to doing subjects I liked and, by November, I hated them all.
I'm not trying to put you off, I'm just saying don't wish your life away because at some point you'll wish you had this life back!