It's not needed, and it's very unlikely you would be permitted to take a graphing calculator into an exam. Outside of an exam anything you could do on a graphing calculator you can do easier and better in MATLAB so it's a bit redundant.
If you are able to and/or should get one, they will tell you when you start the course. Anecdotally though while I was doing engineering, I think I used my graphing calculator like twice in 3 years...