General meaning of the sentence
If you consider the list thing as an expression, you can rephrase it and see that the first sentence means: "every student gives a certain importance to academics". Indeed, "to put something at the bottom of your list" means "to give it the smallest priority, to consider it not important at all". If not a single student does that for academics, it means that they all give a certain importance to them.
In this very context
However, in this context, you see by the beginning of the paragraph that students took part in a kind of poll. They were expected to prioritize different activities by importance, most likely by making a list. The sentence you put in bold probably refers to this list. The results of the study show that from all the answers recovered from the students, there is not a single one where the student put academics at the bottom, meaning that not a single interrogated student considered that academics were the least important activity in their life.
As for the second part, it is used as a transition between the first information (every student gives importance to academics) to the second information (59% expressed a desire to pursue). The expression "not content with" is used as an addition. If you rephrase it, you can replace it by "Incoming students are not satisfied with focusing on their degree subject, so they expressed the desire to pursue [...]".
On a general aspect, it seems to me that this article's purpose is to emphasize the fact that young people actually consider studies a very important thing. It is probably an answer to some critics which were emitted previously, as states the very beginning of the paragraph: "in a rebuff to critics [...]".