From this year, it has been decided that JEE Ranking will be based on two parts:
1. JEE Main marks (60%) 2. Board Marks (40%)
The problem lies with the second component. (40% boards - weightage of 144 marks out of 360 total)
It lies in the fact that the JEE main written exam has a short head (meaning all of the marks are concentrated in a very small percentile from 97 to 100, so students getting a percentile within this range will gain disproportionately large marks - marks drop from 300+ for 99.5%ile to 80 for 96.8%ile), and a very long tail (meaning all students ranging from 0 to 97 percentile will be awarded almost the same marks - range of about 0.4*80 = 32 marks).
Short example showing the blunder:
A student scoring 92% in CBSE Boards (getting 96.5%ile will get 0.4*80 = 32 marks out of 144)
A student scoring 96% in CBSE Boards (getting 99.6%ile will get around 0.4*300 = 120 marks out of 144)
A mere difference of 20 marks in boards (which should have ideally contributed 0.4*20 = 8 marks difference in final ranking) gets amplified by a factor of 1100% (120-32 = 88), and thousands of students will lose out in the new system.
So please i request all the students to work hard for thier board exams as they will help you to get into top colleges of India...