How to prepare for the CBT exams?

Hello,
I'm Pursuing a BBA(Bachelor in business administration) distance education program from ICFAI Tripura university. I'll be appearing for my exams in July.
Accountancy
Quantitative methods
Economics
English
Management
IT systems

I've just realized that its going to be CBT(Computer based test) exam. It is quiet stupid of me since all this time I thought it was a written exam. The university has not provided any model question papers for reference and I don't have any idea how to prepare for the CBT exams.
I want someone who could assist me by helping me understand how these exams are conducted and how to prepare for the same. It would be really helpful if someone could run me through this.
My email ID is: nikhil4420@gmail.com