Turkish
You are not alone. Part of my job is to give ad-hoc training to individuals or small groups of people who have been struggling. I see a lot, as I specialise in Gen Nav, one of the subjects many people have difficuty with. They come from all sorts of bakgrounds, all schools, full-time and distance learning.
On the other hand I have known a student who had left school at 16ish to be a farmer, came to us 20 years later and passed the lot first time in the usual 6 months. It can be done.
Good luck!