try this:
Schedule yourself an allotted time to check your balls for growth, you may find it easier if you start with a once/twice a day only routine. but put it in your phones calendar, perhaps first thing in the morning then last thing at night.
Only allow yourself to check during the appointed time, if you are anxious then tell yourself this: “there is no feasible way my balls can have grown something between now and this mornings exam, its only X hours until the evening exam, they can wait.”
Now if you can manage to stick to your twice daily exam for say a fortnight then I’d suggest that you drop ether then morning of evening exam, then if you manage that for another 2 weeks you could try every other day, and so on.
Hope that helps, now wash your hands.