Hello aspirant

hope you are doing well and safe. With reference to your query,  I would glad to inform you that at your rank your sons holds very low chances of getting admission in government colleges like nits and iit . I would advise you to tell him to start preparing for next attempt and score better . Following is the cut off for reference:-

https://engineering.careers360.com/articles/jee-main-cutoff

Hope you found this answer informative. Best wishes for your future