Maybe try some of this:
- Don´t upset too much if you make some mistakes. Everybody makes them. That´s what the learning is. Try to learn from them - maybe you put correct personal suffixes in the end of verbs, but you don´t remember which suffix must be appended to nouns for particular verb (for example: bana kızdırdı or beni kızdırdı ?) If you find subject in which you make most mistakes, study it again.
-Check correct answer and try to remember it. Then come back to this test few days later and see if you remember it.
- Maybe you should try to find the best strategy for your learning - choose whether you prefer studying often but for short time, or for example once per day but for 1 or 2 hours.
Hope it helps. Please, don´t discourage and keep fighting 
If you want to learn then one day you will speak Turkish like a native (at least that´s what I keep talking to myself 
) Good luck and don´t give up!
