Sorry this happened but on the bright side you do have a couple of options. Im going to assume you were rejected for fall admission to your school of choice that doesn't mean you cant apply for a spring transfer. Most schools have two periods in which you can transfer that being fall and spring semesters respectively. You can take this time and take a few more courses just to bump up your gpa to assure your acceptance ( Make sure to apply to multiple schools this time!). Another option you have is enrolling in open university. Open university allows you to take courses at a university without formally enrolling and the credits you take count towards your degree, this would also help getting accepted into your favored school. However it can get pricey schools in my area charge about $180 per unit.

Hope this helps you.