Article ship completion and Exam eligiblity

I forwarded my form 109 - Completion of article ship in the month of march 2011.  I went on to prepare for my May 2011 final exams. Towards the end of April I received a letter  from institute that I have taken excess leave for 26 days. As the exams were near, I wrote the exam with out  re-registering. Kindly advise the course of action which I should take.