Here I am after some time with another load of questions rambling through my poor dumb head for a time.

#1 Accommodation costs 20 pounds or Accommodations cost 20 pounds?

My view: Ive always thought the word accommodation is uncountable but recently Ive been advised to use the plural.

#2 You will get a discount upon presenting a student card/a student's card/a students' card/students' card?

My comment: Ive never understood this one. Is there any rule to using similar phrases?

#3 When we are talking about course units, what do we say? A successful student will be awarded/evaluated/granted/conferred five credits.

That who will answer all my questions intelligibly will be awarded my mum's cake.

Thanks beforehand, friends.

Yours ever-wondering,