Hello,

You have to take out time to prepare for entrance exam. First priority is 12th board so whenever you are in class, focus on what your teacher is teaching and make notes. when class finishes, follow up your note and if you get doubt then ask your teacher next day. keep one hour daily to cover daily home work and read class notes.

for entrance preparation:- take help of online videos if required.

1. Start with easy subject like english which has two section language and comprehension. Take 30 mins daily.
2. Give one hour to legal aptitute and one hour to mathematics.
3. for general knowledge, you can watch daily updated current affairs from Youtube.

if get stuck anywhere then leave it for that day and start it next day again. take guide from teacher, friends who is good in some parts. You can get most assistance from Youtube.

while covering new chapters, take out 30 mins to practice atleast 5 question from the covered chapters.  All in all it will be 3 odd hours to prepare initially. You can extend time span as per your suitable factors.

hope it helps!