JEE Main is the exam for the admission to NITs, IIITs, GFTIs. The exact prediction would be tough for the qualifying marks of JEE Advance as JEE Main 2019 is being conducted twice by NTA and the ranks will be declared based on the percentile scores of the students in both the sessions with the better of the two scores used in case the candidate has appeared for both January and April sessions. Based on your score the expected rank will be around 4,28,400. This is only a approxmate rank.

You can check the admission possibilities with JEE Main college predictor tool.

https://engineering.careers360.com/jee-main-college-predictor

I would suggest you to appear for April session again & try to score well as best of two will be considered.

Good Luck!

Hello Joseph

It would be difficult to predict the qualifying marks as of now. JEE Main 2019 exam is to be conducted twice by NTA for the first time.
51.10 is a low percentile and  with this percentile score, it is difficult to get admission in any decent Engineering College. I would suggest you to appear for the JEE Main April exam also.

Good Luck!