Sikerülne egy angol felsőfokú nyelvvizsga nekem?

Igen :)

Sok gyakorlással sikerülni fog. Sok sikert hozzá :)

Felsofoku requires a lot more than just "átlagos".

2-3 months? I don't know what "nagyon kemeny" means to you but unless you are studying 3-4 hours a day! and practice speaking with natives, it won't work. But that is just my humble opinion ;)

I've studies for 8 years in elementary and 4 years in "szakkozep" and when I went to London and started working for a family I was shocked how poor my English was. This was almost 15 years ago. I hope education has improved since then...