What can I do if I have completed my nursing program, and they are holding to many students by not taking the board exam?

I just wanted to know my school has implemented a new system to the students just a month of our graduation. Do they have the right to change the policy? We were told that by doing a ATI virtual and achieve the green light to school we are ready to take the NCLEX and now some students had that green light. But after we all graduated they change the procedure again and we have to finish the proctor test. I remember what the assistant director told us it just an assessment but it’s not graded. When I have achieve my green light my school is prolonging the agony to all the students. I have spend so much money paying them monthly and also many students complaint to the board of education but its seem that their not taking any action. Another thing they in my last batch 6 of us failed the same test, and for me this is discrimination for me because they pass 5 people and I ended up taking one class over again. I found out that those 5 students received a phone call from my school saying that they have pass that subject and I didn't. Which is I don't understand we all took the same test and according to the policy if you fail the test 3 times you have to repeat the class. Eventually, it only happen to me and the rest they let them go. There is no consistence in my school. Can somebody help me? Thank you.