How do you mean buy your way in?
Pay the principal or administrator to give you a place? Sure, if you can find a dodgey one.
You can pay to go to college as well

But it is free if you're under 18, dependent on which college you go to (private or public).
Are you worried you're going to get bad results?
There are other options, talk to the college
They can come up witha plan of action, may mean re-taking some courses (GCSE's or AS Levels, depending what stage you're at).