I score 67%ile in one mock, then right away 98%ile in another. Scared for the exam

Tho my 95-98 percentile frequency has increased but sometimes I score really really less and then I don't get satisfied by that score , I give another one and score much better. I always get scared what if the 67%ile mistakes happen in the real exam.. How to overcome this My main focus is on revisions and mocks But out of pressure and fear and dissatisfaction in mocks sometimes I attempt two mocks in one day other than NMAT ones. What happens now?