People enrol at universities or colleges for a variety of reasons, including gaining experience, expanding their knowledge, or preparing for a successful job. There are various other reasons, in my opinion, to pursue tertiary education. In the following lines, I'll go over those reasons.

First of all, the main reason why I feel students enrol in universities is to get the higher education. During schooling or graduation, some pupils develop the extreme interest in specific subjects. Hence, they continue studying those subjects deeper and deeper, not only to acquire complete knowledge about it but also, to make more discoveries. For instance, some students do have a good job even after having a Master’s degree. Still, they do PhD so that they can make new reforms and discoveries in the subject of their choice.

Next, sometimes the present jobs of people demand them to have a higher degree. For example, in India, several candidates get placed in multinational companies, while studying, via Campus Placements. But, the salary packages that they are offered seem insufficient to them. Hence, they continue university education so that they can acquire a tertiary level degree and increase their chance of promotion or growth in their company.

In conclusion, the reasons why students join colleges or universities are purely personal preferences. Some study to increase their promotion prospects while others have innovative minds. Hence, narrowing down the list to come up with a fixed number of reasons would be unfair.