dear student,

There is no specific way for filling the form.but just you have to make sure that we should fill up colleges according to our marks.Firstly We should write the top colleges for which probability of getting admission in that college is less.then next colleges to be filled are the for which there are good chances of getting that college.These are the most important as mostly you are going to get one of these colleges so preferences should be given carefully

hope it helps!!