Hello Aspirant,

Still the cut offs for January 2020 are not released. But they might be around last years cut off. Here are the last year cut off of jee mains

Gen:89.7548849

Ews:78.2174869

Obc:74.3166997

Sc:54.0128155

ST:44.3345172

Pwd:0.1137130.

This year also the cut offs will be around above mentioned. This year total 869010 students attempted in January. There are students increased to 1200000 to attempt in april. You can calculate approximate ranks using formula h(100-your percentile)*total students attempted /100. Using this you will get an approximate  rank. If you want to predict the colleges you can use the below link:

Hope this is useful