You are able to receive a visa for 3 months to up to 3 decades, but it is all dependent on them how long they will provide the visa for you! Your visa might not be renewed in case you haven't passed your course, although that is dependent upon why you failed and if you may fail again. You will only have to submit an application for a visitor visa if you aren't from avisa waiver country. You may check our visa checker tool to confirm your eligibility. It is impossible to add your partner to your student visa for a dependant. Dependent children of short-term work visa holders also require a student visa.