You can prepare by yourself if you know the portion for your exams.
Prepare your own questions and answer them.
Clear your doubts with some adults or on the net.
Read and understand the content in your text books.
Do all the problems and sums in Mathematics.
DO NOT PANIC!!!!
See that you are perfect with the portion.
If you do this you can easily crack your exams even if the portion is not complete.
If you do not know to portion study all the lessons that you think will come for the exams, but it is better you confirm it.
Please mark my answer as the best if it helped you.
Have a nice day.