Should I fill the form for the 1st round of counselling even when I know that I'm not going to get my preferred college in the 1st round?

Yes, you should fill the form for the 1st round of counselling even when you know that you are not going to get your preferred college as 1 student has given a lot of examinations, as a result of which students who get better opportunities skip the remaining counsellings and there might be a chance