The support that you can get at college varies and so it's really important that you visit before you apply. Even if you are not sure that you definitely want to go to a particular college, it's a good idea to arrange a visit because it may help you make up your mind. It's also important to visit when other students are around so you can find out if the college feels right for you.
If you feel that your local mainstream college may not be able to meet your needs or would prefer to go to a specialist college you will need to show that the mainstream college cannot meet your needs. There is an appeals system if you don't think the decision is fair. If you want a specialist college place, make sure you apply in plenty of time.