How can I boost my concentration?

I have a big exam just in 84 days, I'm not ready yet, I can't concentrate on my lessons and I just lost my hope because it is the second year I'm trying for it. I can't even sleep right! I sleep like 6-7 hours from 3:30-4 A.M. to 11:30.
What am I doing instead? Good question! Walking and daydreaming, mostly + switching between 3 apps, on occasion :|

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Socialclutz · 36-40, M

Go to sleep at 10 pm. Eat some damn veggies and fruit. Stop daydreaming and buck up those lady balls while getting head in reality.

Andromeda · 26-30, F

I will go, but I just can't sleep. You are right about the veggies though. I feel a rush to ddo that.

Socialclutz · 36-40, M

Focus on spinach it'll help you to sleep. You're in a routine that you need to break because that is truly unhealthy.