It involves getting a government-approved invitation letter.
The embassy will crosscheck your hotel reservation and other supporting documents.
You should strongly desist from paying for flight tickets and hotel accommodations before visa approval.
You need to book an appointment to submit your documents and application form when applying.
If you want to apply for Switzerland student visa in Nigeria, you will need to apply for a National Visa D.
One point to note when applying this visa in Nigeria is that the appointment booking process is seamless.