If you have real, justified reasons to believe your SATS results are wrong, you need to contact the college board and calmly explain your reasoning.
Exams are very stressful for everyone and even the best student can fail through nerves or stress.
That said, exam results are not always correct, and if you honestly believe that yours are incorrect you can certainly get them reassessed.
A similar thing happened recently with a science GCSE that my daughter took. She got a C grade but was literally one mark off a B. Her teacher sent them away for remarking but unfortunately they could not find anything to justify the extra mark.
Hopefully for you, things will be different. Don't give up until they listen to you and check the results again, you deserve a fair hearing - this is your future at stake.