JEE

There's a possibility of getting into some state-level government colleges or newer, less competitive NITs, especially if you are flexible with the branch of engineering. 

With a JEE Main All India Rank of 612097 in the SC category, it's highly unlikely to secure a seat in a top-tier government engineering college  (like an NIT or IIIT).

No, with an 83.5 percentile, getting Computer Science & Engineering (CSE) at any NIT is almost impossible.

CSE cutoffs at even lower-tier NITs typically require 97–99+ percentile, and top-tier ones demand 99.2–99.5 percentile

140 marks in JEE Main often converts to approximately 75–85 percentile, depending on exam difficulty.

This likely corresponds to a JEE Main All India Rank (AIR) in the range of 40,000 to 60,000

• unless your percentile is much higher than estimated (i.e., < 20,000 AIR).

• With 40,000–60,000 AIR range, CSE admission becomes highly improbable under both All India and Home State quotas.

With a CRL rank of 3,69,000 and OBC-NCL category rank of 1,32,000 in JEE Main, getting admission into top government engineering colleges in Delhi like IIT Delhi, DTU, NSUT, or IIIT-D is highly unlikely.

You can opt for some semi-govt or state government colleges.