What is wrong with my raw scores?

I calculated the raw scores of English and Gat (had no courage left for the domains) the exam was on 18th May, shift 2. And I never walk out of the exam room feeling confident about my result but this time I did but the provisional answer key says otherwise. I scored 159 in english and 75 in gat after several recalculations. How is this possible? I was doing good in mocks, I was scoring 200+ in english and 100+ in gat? I don't get it what went wrong, no I wasn't anxious or impulsive during the exams I had all my senses in place. This is a huge gap from my expectations. Was the shift hard? Is the answer key wrong? What is it?