If you are over eighteen and enrolled in a short course, you could qualify for a short-term study visa. For the majority of short courses, this is good for up to six months, and for English language courses, it may be extended for up to eleven months.
Make sure your selected university has a Student Sponsor License if you're taking a lengthier course. In order to attend an independent school in the UK, you may apply for either a standard student visa, which is available to those 16 and older, or a kid's student visa, if you are around the age range of four and 17.