However, ‘enrolment’ is mainly used in British English, while ‘enrollment’ is preferred in American English. It’s just a matter of regional spelling preferences.
It would be understood, and sounds natural, but the -al is not necessary; "vacation" is a perfectly good adjective. And, ate to brake this too you, but even people running shools sometime make usage airs. By the way, I believe your example about the "vacational college" was a typo or brainfart for "vocational". As for your example in comment above, I certainly wouldn't follow the usage example ...
It refers to a person who is unemployed, not receiving an education or in vocational training. I'm not sure if the acronym is commonly-used in your country, but if it is, then do you use it to describe someone who are in their late 30s, 40s and 50s also?
What does enrolment mean? Enrolment is a noun that can refer either to the number of people signed up for school or other services or the act of signing up for school or other services.
ENROLMENT definition: 1. the act of putting yourself or someone else onto the official list of members of a course…. Learn more.
Definition of enrolment noun in Oxford Advanced Learner's Dictionary. Meaning, pronunciation, picture, example sentences, grammar, usage notes, synonyms and more.
Enrolment is the act of enrolling at an institution or on a course. A fee is charged for each year of study and is payable at enrolment.
ENROLMENT definition: the act of enrolling or state of being enrolled See examples of enrolment used in a sentence.