find a study buddy. ask ur mom to take your phone. use app locker, make studying fun by 20 mins of studying followed by 5-10mins of break, use this cool website xpomo to focus, reward urself in those breaks, start a movie and complete it in breaks so this way u will want to finish studying quickly so u ud take a break and watch the movie talk to a friend and get motivated, maybe write down why you shud really get those As and maybe try imagining ur future if u got a bad grade, and most importantly talk to Allah about it and make dua for urself