Hii aspirant ,

Coming to your question I would like to tell you that as you are in SASTRA university as a student of first year you had already paid the required fees for the first sem as it comes under the process of the admission , now if you are decided to leave the college after the first year tha only the 1st year fees will be paid by you because the 2nd sem fee will be paid in December or January month, you don't have to pay any extra amount only the college fees you will have to pay to leave the college after one year.

Hope this helps you, 

Good luck.