I have my exams after three weeks but i'm not prepared yet. I still have some notes undone. what should I do?how should i prepare?suggestions...

Would you please be more specific? What exams are you
taking? Do you mean you are taking exams in three weeks? What notes aren't done? If I
know more, I can provide more help.

Here's a study tip
though--flash cards. You can make flash cards. You can use different colors for
different subjects. Just by writing down the question and answer helps retention
immensely.

There's also a trick to using the flash cards.
As you read them, if you get the answer right, move it to the back of the deck. If you
get it wrong, put the card somewhere in the middle. When you do it that way, you are
reviewing the material you don't know the most. It really
works.

Why don't you create flash cards for the notes that
are undone?

Another way to study is divide your paper in
half. Write the key concept on the left and all the ideas associated with it on the
right. Be sure to summarize. Research shows reading those notes seven times improves
your grade. The very practice of creating notes and flashcards counts as
studying.

Also try to calm down. Study and keep reminding
yourself you can do this.