"Um... you can buy either particular classes, or the buffet pass?  I'd advise the latter if you can afford it?  The main distinction is that if you want to be one of the Upgraded students in a class who get particular attention and monitoring from the Professor, you need to pay the Upgrade fee for that class and get the Professor's permission - there's no such thing as an Upgraded buffet pass."

"Um... you can buy either particular classes, or the buffet pass?  I'd advise the latter if you can afford it?  The main distinction is that if you want to be one of the Upgraded students in a class who get particular attention and monitoring from the Professor, you need to pay the Upgrade fee for that class and get the Professor's agreement - there's no such thing as an Upgraded buffet pass."

"Um... you can buy either particular classes, or the buffet pass?  I'd advise the latter if you can afford it?  Though if you want to be one of the Upgraded students in a class who get particular attention and monitoring from the Professor, you need to pay the Upgrade fee for that class and get the Professor's agreement - there's no such thing as an Upgraded buffet pass."