I cant see a dentist because of my exams, but i think i have a tooth infection, same area and symptoms as before, but ive taken antibiotics 3x already this year for this infection, can i take it once more? its painful, thanks. worried about resiste?

Whether or not you can get an appointment, at least ask the dentist's office. Nobody should take any antibiotic without health professional advice. Also see the reply to your other question.

The antibiotics are not curing your dental problem and your symptoms could get worse so that you won't be able to take your exams. Treating yourself is not the answer, your infection is spreading, so go to an out patient walk-in dental clinic after exam hours.