1.I didn't apply AP and EAD when filled 485. Am I a AOS status?
-Not yet. Your status is still F1.
2.Can I transfer to another college as F1 right now?
-No, because of your immigration intent, you can not extend your F1 status anymore.
3.Any problems for extension current I20 in same college?
-No.
4.If transfer or extension is denied, my 485 will be denied too?
-No. It is irrelevant.
5.If transfer of extension ia denied, can I finish current I20 study?
-Yes. Your F1 status will continue until your current I-20 expires.