In order to prepare & score good in the exam your concepts should be clear specially in Mathematics for this you can prefer NCERT books. Aptitude section is the easy section in the exam where you can easily score good marks, You need to have only good aptitude and mental ability.

Go through with the previous year papers to know the level of the questions & try to solve them, Do practise with the drawing test.

You can prefer the books given below:

Architecture Entrance Book- P.K. Mishra

A Complete Self Study Guide for B. Arch Entrance Examinations- Arihant Books

For further information what you need to carry in the exam, you can go through with the given below link.

https://engineering.careers360.com/articles/jee-main-what-you-should-carry-exam-hall

Good Luck!