Hello jigar,
Yes, you cam attempt both paper of JEE main. But it's count as two attempt.
There are only three attempt is permissible.
Originally every candidate has a maximum of three attempts for JEE Main.Candidates can appear twice for the entrance test in a year.So this is used in correlation with the original number of attempts, from 2019 onwards, JEE Main number of attempts in total will be six.
Click the link read full article about JEE main attempt-
https://www.google.com/amp/s/competition.careers360.com/articles/ssc-cgl-eligibility-criteria/amp
Thank You.

Hello, Aspirant
Yeah, it is your you can write both at one time
However time slots for both shown below.
Paper 1: 9:30Am to 12:30pm ( Btech Courses)
Paper 2: 2pm to 5pm. ( B.arch courses ).
Here, you can give both papers at same day but different slots.such that you can choose for both NITS and B.arch courses.
To get anymore details once visit the below link:

https://www.google.com/amp/s/engineering.careers360.com/articles/jee-main-frequently-asked-questions-faqs/amp

Thank you!!

hello jigar

yeah!you mean to appear in both the jee exams of jan. and april,

you can appeared in both of them, the better one result of two will be considered.

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