Hi Dear , 

according to me , every college has their own rules and regulations and if college allow you to convert your correspondance into regular so you can you hae to talk college authorities . 

i hope this much information is helpful for you 

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good luck 

It depends on the college and it's norms. If your college accepts for a valid reason such as any medical aid and providing a supporting medical certificate supporting the cause and paying the condonation then you can continue the course only by giving the exams.