Dear aspirant,
See in order to focus on studies properly here are a few tips that I'd implemented
#1 create a time table of when to study and when not to
#2 if you don't know which subject you like find out what you don't like
#3 start small and build up. Create study slots of 1 hour 12 mins Initially. The reason I said extra 12 mins is because you'll end up after 1 hour tired and exhausted.
#4 after you are tired in an hour take a break and reward yourself with a chocolate as chocolates help increase concentration.
#5 do this for a week and then increase session duration to 1 hr 50 mins and then follow the same chocolate reward patter
#6 after following it for another week now you'll be almost set increase duration to 2 hours per subject and surrender you mobile to your parents this is the zen mode no distractions full on study.
It takes 21 days to make or break an habit.
Atb