Every student has a Gringotts Bank vault. They have a certain number of galleons, sickles, and knuts. You spend your money on extra tutoring sessions, more time on exams, homework passes, and hints on exams. however. you can also buy other things like brooms, cloaks, and more that can earn you special privileges. Keep in mind that you HAVE to contact me (Albus Dumbledore) in the contact form below that you want to spend that amount of money on one of the options. Failure to do so will result in expulsion. I know that I said no one will be expelled, but this is a more serious matter.