It changes every year.

Itcompletely depends upon the cutoff every year.Generally, for the 

• General category:-you have to score above 220
• Reservation Category(SC/ST/OBC):-You have to score atleast between 100 to 120 depending upon the type of reservation.

Hopefully this helps.

Hello Aspirant,
I am giving you the range for the marks and the approx rank for the same.

>310 - Less than 100 rank
309-290 - 101-200 Rank
289-270 - 201-500 Rank
269-255 - 501- 1000 Rank
254-247 - 1001-1500 Rank
246-240 - 1501-2000 Rank
239-232- 2001-2500 Rank
231-225- 2501-3000 Rank
224-217 - 3001-3500 Rank
216-210 - 3500-4000 Rank.

Please note this is just and approximate figure which will give you some idea about the range. 
Hope this answers your question. Good Luck