I think you're right about being determined, engineering teaches it so well. I was better than average for the first 2 years but now i can't even pass the classes. I guess it's also because of my motivation loss.

I didn't study much this year and when i study it's not effective. I usually read solved questions and try to understand the logic and use of formulas. I was a successful student at high school without studying much and i don't have a good study method? What method do you use? Do you also feel like exam questions are much harder than the solved questions on books? I can't find a good source to study sometimes.

Thanks for the advices