u/humble_kerosene

So i had started learning java in mooc.fi course by the university of Helsinki. And i had reached part 4 file handling but then my college exams came and after then i just lost the motivation to continue it. Yesterday when I opened the course I couldn't recall what I had learned earlier, ofcourse I know revision will help but revising all the four parts would take some time.. do you guys know of any other way to recall the concepts? I am also afraid I have forgotten the tips they gave during the earlier parts and don't wanna lose that but maybe that's inevitable..