Having mentioned that you are a topper in all the unit tests, getting a CGPA of more than 9 would be an easy task for you. Having 20 marks in all your internals would be even more beneficial.
To get a CGPA of 10 is possible, in your first year. Here are some things you should keep in mind for your preparation.
Presentation is one of the most important aspects. While writing use blue or black pens. Write answers in points and use Sub-headings. Try to keep your answer sheet neat and tidy and avoid unnecessary scribbling.