Go to your local Immigration and get their list of requirements for the Visa or Extension you require then just tick everything off as you prepare your application
I understand now that he was looking at a page on the RTE London website for Visa prices which does list Non-O multi-entry long after they stopped issuing them when eVisa went live
Have you got the documentation you require from your school? You know Visa applications are now online but from the country you will be applying through don't you?