Hey

Expected marks range vs rank range JEE main -:

Marks range - Rank range

310-360              1-100

290-309             101-200

270-289              201-500

255-269             501-1000

247-254           1001-1500

240-246           1500-2000

So, to get a rank below 2000 , your marks must be in the range of 240-360. 

To get more information , check this once -: https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://scoop.eduncle.com/jee-main-toppers-rank-list&ved=0ahUKEwj22vWBi5XYAhUFwI8KHbCAB6IQFggeMAA&usg=AOvVaw0muilPWVRNFkEwdY1Kvtbt

All the best!