i'm in high school and i have 4 tests to make next week, and a presentation to do. i didn't have motivation at all for the longest time, but i want to make my mom happy so i started preparing for them anyways. but it's just not working out. 

for the presentation i have to read a book, which is going okay i guess. 

but the tests... i'm unable to get some fucking work done. especially on biology and maths. when i don't understand the slightest thing, my little bit of motivation is entirely gone and i stop working. and i can't bring myself to keep working. any advice?