Sir J.J College of Architecture

There are very few seats for general in both the colleges. Also, in NIT, minimum board percentage should be 75%, so you will not get NIT.
For Sir JJ, the admissions are through 50% board + 50% your competitive scores. Your board percentage seems less, so the chances are very thin.

Admission is through counselling conducted by Directorate of Technical Education, Maharashtra based on marks obtained in 10+2/ Diploma and score obtained in National Aptitude Test in Architecture(NATA).
You will need a valid NATA score to secure admission for this course.
Regards.

https://www.shiksha.com/b-tech/resources/jee-advanced-rank-predictor
I am sharing rank predictor link with you. You can idea about the college you can get by this.
Good luck.

You can apply this college by giving the exam of JEE Mains Paper- II.

Admission is through counselling conducted by Directorate of Technical Education, Maharashtra based on marks obtained in 10+2/ Diploma and score obtained in National Aptitude Test in Architecture(NATA).
Selection parameter and weightages:
10+2/ Diploma marks - 50%
NATA score - 50%
For further details regarding eligibility and selection process for this course from Sir J.J College of Architecture please refer to the link provided below:
https://www.shiksha.com/architecture-planning/course/b-arch-sir-j-j-college-of-architecture-mumbai-71170