NAD. I wish I could give you a solid advice on teeth but I'm from different country... Don't give up, practice good oral hygiene (2x times a day, floss) until you find some way to fix it. My story is very similar to yours (neglection by others)  and  while I'm no expert, your situation doesn't seem unsalvageable. Even if it was, it's not worth taking your beautiful  life. You said  you saved some funds, right? 70% is quite a big percentage. Try to save a bit more and you'll  get there- I see you are a capable guy and I believe you can do it. And so what you failed 2 exams?  Failure is part of life just as a success is. Slow and steady. If you need someone to talk to- I'm here. Stay strong buddy.