Your rank should come under 20k if you get 160 marks in Jee main but I would suggest you to increase your target from 160 to 200 or above so that you can get admission in decent NITs and in top branches like CS, ME, ECE etc.

Apart from this, you can go through the below link to check Jee main marks v/s ranks in detail -

Marks v/s Rank

Hope this helps!!!