Hi Pallavi,

It isn't easy to apply and complete a three year degree course in one year. IGNOU prospectus says 3years is the minimum time period in order to finish a degree. Also, you're talking about a practical based course and you have assignments too in IGNOU. So, all you can do is, appear in either june or december session exams at once and complete more than the required credits at one go. That's all. This way you might complete your degree fast but then it may or may not be valid. You may consult your regional center for more details on this. Choose wisely. 

Hope this helps, good luck to you!