At Calicut University, you have five years to finish your degree, and after paying the fine, you can write your supplementary exams. If you have a supplementary in one of the two other subjects, or both, you will have to work much harder because they are very strict.
You must be neat, practice a lot, and work on your writing skills. It all comes down to presentation. Have a good copy. Please don't cross things out too frequently, because if you already have a supplementary, chances are you'll get one again if you don't do it neatly.