Last 5 AIMCAT %tile 61-85-88-81-84. Is this an accurate predictor of actual percentile in cat,

No,AIMCATS are more difficult and much more competitive than actual cat so u can expect a much better percentile in cat ceterus paribus

I am scoring around 65+ score in AIMCATS but the percentiles are really varying which is really demotivating sometimes it is 75 percentile with a score of 65 and sometimes it is 49 percentile with a score of 65+. What should I do?