Hi Syamsai.

The exact percentile can be known only through the result. But, you might be able to get a percentile somewhere between 97 and 98. According to last year's Marks vs Percentile comparison, you should get around  96.4  to 97.138 percentile, but because this year the exam was of 300 marks, so you expect a higher percentile (97 - 98).

All the best!