IIT preparatory courses are offered by various private coaching institutes and some IITs themselves might have preparatory programs, often as part of outreach initiatives. Each institution sets its own admission criteria, which might include:
* No minimum marks: Some might accept students based on interest and availability of seats.
* Entrance test: Others might have their own entrance tests with varying difficulty levels and required scores.
* Academic record: Some might consider your past academic performance in school.
* Interview: Some might conduct interviews to assess your aptitude and suitability for the course.
To find the minimum requirements, you need to specifically check the admission criteria of the individual IIT preparatory course you're interested in. Look at the websites of the coaching institutes or IITs offering the program.