Hello,

JEE Main is conducted twice in a year and the best of two is considered which means the highest score is considered. Your brother's score is highest in January session whereas in September session his score is low so based on the marks scored in JEE Main January session rank is allotted.

NTA has released JEE Main Paper 2 results and the score is available in the official website jeemain.nta.nic.in

He doesn't have to worry ask him to check the rank and here is the link to the cut off for NITs in 2019 for admission to B.Arch https://engineering.careers360.com/articles/jee-main-cutoff-for-b-arch-b-planning/amp

This will give an idea about the cut off. You may as well tell us his rank so that we may help you further.

Alternatively, you can also predict the colleges in which he may get seat using our JEE Main Paper 2 college predictor

https://engineering.careers360.com/jee-main-architecture-college-predictor?icn=QnA&ici=qna_answer