The fact that, young crowd prefer working and traveling between finishing high school and starting university, is true. And i'm going to discuss advantages and disadvantages in this topic.
Firstly, traveling in this period has some advantages, for example, relaxing and calming down after a hard schools year. In this period if you had extremely hard education program or difficult exams, you may travel and not only have a good trip abroad. But also these acivities, will provide you with a good memories in the future. Or you can learn something that would make you popular among friends, which also like traveling like you or even in a group with you. Consequently, traveling can make you be in mental and physical fitness.
Secondly, if you had not that good grades and can't be ready for a university, this type of activity would impact your grades and knowledge level. Consequently, you won't be happy to see how are your grades are low, comparing to other students. However, in this period between high school and university year, instead of traveling you can, get ready for university, just having one or two hours a day, reading books or repeating the lessons you have passed during the scholar year. Although, if have or can get free time, you can travel to the regions or touristic places in your country where you live.
In conclusion, traveling or working between high school and university, can increase your knowledge, or even decrease it, if you had bad scores in your lessons and exams.