unfair unit test should not be counted for the class

We grade 12 students of Mrs. Giraudis physic's class do not want our unit test to be counted in our final mark . The class did very poorly since the teacher made it completely different from the test review she gave us because of one student that apparently cheated by having a copy of the test on the test day. As a result Mrs Giraudi changed the test and made it completely opposite from the test review and is weighting it 200,  the weight of 4 tests which is completely unfair and bizarre because it makes no sense to make it a weight of 4 test because it will bring our mark extremely down. It is the end of the school year , and she does not have the right to torture us by decreasing our mark knowing the fact this test was going to bring our mark down because it was not what she taught us for the test due to one person cheating from another class.
We request that you ask Mrs Giraudi to give the a test a low weighting or not consider it .

Thank you ,