Hey Rohan.

See ur son's percentile score is too low for him to bag a seat even in any if the good NITs IIITs or GFTIs for pursuing his higher studies in the field of his interest under btech courses. U should be going for private Institution for his btech career. I m providing u a link for ur help.

https://www.google.com/url?sa=t&source=web&rct=j&url=https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning/amp&ved=2ahUKEwj7mLqy05viAhUXk3AKHSXSAKAQFjAAegQIARAB&usg=AOvVaw2MH5TbFgLJzAvPJZWHnUEp&ampcf=1

Ask if any query. Good luck