The sub-category in which you will apply for is dependant on the course level. If the course is considered as NQF Level 3 or above, the educational provider should advise a student on the applicable sub-category of visa. There are many benefits of studying in the UK, and a Tier 4 student visa allows you to take full advantage of these.

https://www.visaandmigration.com/service/tier-4-student-visa/47.html