It depends upon the JEE Main and JEE Advance cut offs, If You manage to qualify the exam by achieving the cut off, You can apply for JOSAA Counselling. It should be noted the cut off for EWS/SC/ST/FEMALES/OBC category is lower than the general category
However It is usually advised to fill the choices as per the preference of colleges and departments, for example CSE in NIT Trichy is your priority followed by CSE in NIT Warangal, you can fill CSE at NIT Trichy at serial number 1 and CSE at NIT Warangal at serial number 2 and so on and so forth. However to get any NIT, you must have qualified JEE Mains and to get any IIT, you must have qualifies JEE Advanced

But the previous cut offs of colleges should be taken in consideration, it is better to research over the cut off of colleges then make a preference list of colleges and fill accordingly

For the college preferences and the courses provided by these colleges and to know which colleges participate in the JOSAA counselling, please go to the below mentioned link: https://engineering.careers360.com/articles/josaa-participating-institutes/amp

Hello,

The passing marks which is also known as qualifying marks for JEE Main is given in terms of percentile score. The qualifying cut off percentile for JEE Main 2021 will be given after the final results are declared. Last year the qualifying cut off percentile was as follows

• General: 90.3765335
• EWS: 70.2435518
• OBC-NCL: 72.8887969
• SC: 50.1760245
• ST: 39.0696101
• PWD: 0.0618524

In 2021 the cut off percentile is expected to be as follows

• General 90-95
• EWS/OBC-NCL: 70-75
• SC: 50-55
• ST: 40-45
• PWD:1-2

You haven't mentioned the category you belong to. Assuming that you belong to general category you need to score 90-95 to qualify in JEE Main.

Cut off depends on the total number of candidates appeared, difficulty level of examination and total number of seats available etc. It may increase or decrease depending on these factors.