Doesn’t matter, do whatever, spend time with it. You can get through the track pretty quickly too by skipping the background texts, just reading the actual instructions, the point is to just type out code, get used to using the language. Google your way through old exams and course exercises, those are going to be better targeted at what you really need to know.
First off I’d check to see if you’re university is using python 3 or python 2 for the exams.
Codeacademy teaches python 2.
There’s not much difference but depending on the amount of time you have you might want to look for python 3 resources.