Hello Rizwan,
IIT ke eligible hone ke liye aapko 12th me minimum 75% score karna padega.
Ye CBSE board ke liye hai, agr aap dusre board se hai to ye alag hoga.
So,
Good Luck.....!!!

I got 173 cut of which engineering college I got

Hey !
The minimum eligibility is that,  The candidate should have passed 10+2 or equivalent examination with an aggregate of at least 75% marks. For SC/ ST and PwD candidates, there is a relaxation of 10% as they need the aggregate of minimum 65% marks.As you have mentioned about admission into IIT, you need to qualify the JEE mains exam and then you have to attempt JEE Advanced and clear it with a good score. Check the below link for information regarding JEE Advanced.
https://engineering.careers360.com/articles/jee-advanced-eligibility-criteria
Hope this helps
All the best !

75 % Minimum..

Thanks For Asking.

Dear aspirant,

According to your query,

For getting admission in any IIT you need to clear one entrance exam which is JEE mains+JEE advanced . Now the foremost eligiblity to give this entrance exam is to achieve at least 75% aggregate in class 12th in PCM subjects so it is clear that you need to achieve this percentage. Your class 12 th marks should be good and more than 85% to get a good merit rank in JEE but more than that you need to score good in JEE advanced to get IIT.

Hope you find it useful.

Best of luck for your future.

Thank you.