Average, in what?
Academics? Yes.
I know several people who were 25%ile or so till their 10th or 12th grades. I was in top 15%ile in 10th and bottom 10%ile in my class 11. I was 30%ile or something in Class 12th CBSE. I almost flunked my English boards.
Persevarance? Speed? Accuracy? No
BITSAT is an exam rigged in favour of those who can handle high pressure situations and do well under time constraints. 150 questions in 180 minutes is no joke. It needs a fine balance of speed v/s accuracy. The balance comes with arcane hours of learning and practice. Having a good coach/teacher really helps optimize the return on time spent.
Don’t be discouraged if you are average today. The road is longer for you sure, but you can always run