At Calicut University, to be eligible to apply for a post-graduate course, one must have completed the undergraduate course and provide proof of completion in the form of a Degree Certificate. A Provisional Certificate would suffice as well.
If you are awaiting the results of the Supplementary exams, you will be unable to produce the Degree Certificate and thus will be ineligible to apply. This is based on the assumption that Supplementary Exams indicate that you did not pass a specific paper.
However, if the exams are Improvement Exams, the situation is different.