Standard Visitor Visas can be used if you are studying in the UK on a course of six months or less, or by family or friends who wish to visit you while you're studying - for example, to attend graduation.
Study as a visitor
The course must last six months or less and be offered by an accredited provider, such as the University of York. You can study more than one course during your stay and you are not required to hold a place on a course before you arrive.
You will need to prove that you have enough money to cover all reasonable costs of your visit without working or accessing public funds, including the cost of the return or onward journey. You will be able to use someone else's money to prove this if you have a personal or professional relationship with them, and they will provide support to you for the duration of your visit.
Importantly, unlike a Student Visa, you will not be able to work in the UK on a Standard Visitor Visa. This includes unpaid work, so you would not be able to access placements or work experience opportunities during your stay.