Hello!

you can't predict it as many time seen that paper is easy but student can't score high .

Also according to you paper is easy ,also paper is hard for some other student ,it just a litter luck that in which chapter you are expert question are form that chapter only and you think that paper is easy.

Also there are many shift of exam and not every shift paper are of same level and in which shift you gave the exam may be there is less no of student .

All the best!