This is a spell I created myself.
Step 1: Visualize yourself in a pich black room
Step 2: Create a psi ball inside the middle of your body
Step 3: Say aloud this phrase "At this time my mind is a mess, let me do good on this test"
Step 4: Repeat step 3 as you touch the middle of your chest (where the psi ball is) and then your head.
Step 5: When you feel like your head has cleared up then stop.
Side note: You can add "so mot it be" or something at the end of step 3 if you think it will help.
MUST READ: I am not a master spell caster of any kind so do not yell at me if it doesn't work. Most of the time it is user error. I have learned though that a spell that you create yourself will usually work better. THIS IS NOT GARENTEEING YOU WILL GET AN A+!