There are many reasons why you did not get any allotment in the pmsss.
There are many cases of students where they have 92% marks in 12th and still their name is not present in the allotment list. You can read a similar answer from here.
Now many students fill only limited college and thus they end up with no allotment because those colleges are alloted to the students with more marks.
Check this answer to know how to do an effective choice filling to ensure 100% allotment of college.