How to Control Your Mind?

[Two Face]

You can try giving yourself pep talks.
A pep talk means giving yourself a talk to encourage yourself, to moitvate yourself. Talking to yourself about the imoprtance of the task(exam), tell yourself that this is very important for you and you should work(study) for this with interest and persistence.

Give yourself such pep talk everyday without hesitiation. You can talk give it in mind also if you find it uncomfortable to talk to yourself loudly.

When I was about to give my boards I did this and it changed my attitude towards studies somehow.

Do it everyday. Encourage yourself.
All the Best.