Hello Tanuja,
I appreciate your interest towards computer science and information technology and I'm here to help you regarding that !!
So, there is nothing to confuse between computer science and information technology to pursur degree after successful completion of Diploma course. As you have good foundation in computers during diploma course, you can go for either of the courses and it doesn't make any matter. Do list out your chances based on the rank in the qualifying examination and choose the best college. I would personally recommend you to do research on this field and free free to ask us for further information !!
Hope this helps !
All the very best wishes for your future endeavours !
Regular exam updates, QnA, Predictors, College Applications & E-books now on your Mobile