Before examinations / tests:

I am so worried about this particular subject:-
Philippians 4:6-7
Be careful for nothing; but in every thing by prayer and supplication with thanksgiving let your requests be made known unto God.
And the peace of God, which passeth all understanding, shall keep your hearts and minds through Christ Jesus.

My mind cannot concentrate during revision:-
Isaiah 26:3
Thou wilt keep him in perfect peace, whose mind is stayed on thee: because he trusteth in thee.

I cannot even sleep peacefully nowadays:-
Psalm 3:5
I laid me down and slept; I awaked; for the LORD sustained me.

I am physically and mentally fatigued:-
Isaiah 40:31
But they that wait upon the LORD shall renew their strength; they shall mount up with wings as eagles; they shall run,
and not be weary; and they shall walk, and not faint.

There's no hope for I'm too far behind to catch up
Psalm 43:5
Why art thou cast down, O my soul? and why art thou disquieted within me? hope in God: for I shall yet praise him,
who is the health of my countenance, and my God.

During examinations / tests:

I don't understand what this question is all about:-
Proverbs 3:5-6
Trust in the LORD with all thine heart; and lean not unto thine own understanding.
In all thy ways acknowledge him, and he shall direct thy paths.

I am too nervous to think properly:-
John 14:27
Peace I leave with you, my peace I give unto you: not as the world giveth, give I unto you.
Let not your heart be troubled, neither let it be afraid.

This question needs much wisdom and I don't have it:-
James 1:5
If any of you lack wisdom, let him ask of God, that giveth to all men liberally, and upbraideth not; and it shall be given him.

This question is really impossible to answer:-
Mark 9:23
Jesus said unto him, If thou canst believe, all things are possible to him that believeth.

After examinations / tests:

What will my results be?:-
Psalm 37:4-5
Delight thyself also in the LORD: and he shall give thee the desires of thine heart.
Commit thy way unto the LORD; trust also in him; and he shall bring it to pass.

Doesn't God care if I fail?:-
1 Peter 5:7
Casting all your care upon him; for he careth for you.