There are a number of different visas for study in the UK. The visa you need will depend on your nationality, and how long you plan to study for.
OISC is an accredited institution for the purposes of study visa applications. OISC is also a licensed Student Sponsor with the UKVI.
The quickest way to check if you need a visa is to use the UK Government online tool: Do I need a visa to travel to the UK?