What do you think please answer its vary important?

Discuss this over with your teacher. Maybe he or she feels that you are able to work without a calculator. But if you do not feel that you are, you really should try to persuade your teacher to allow you to use a calculator considering the weight this test has on your future. If, for some reason, your teacher refuses to allow you to use a calculator, consider hiring a tutor for extra help before this test. Best of luck to you, and I'm sure everything will work out.