National Insurance - Personal Tax

Good afternoon,

Can somebody help me with this? I have a question which is a multiple choice question, it gives a list of things
Salary
Company Car
Mileage Expenses paid at 35p per mile
Bonus
Department Store Vouchers
Reimbursed Travel Expenses
Private Gym Membership

And then you have to tick the box to say whether it is class 1 primary, class 1 secondary, class 1a or none?

it doesn't give you any figures how do you know what goes it what section? I have tried reading through the Kaplan book and they haven't really explained it, in fact the whole unite on national insurance is very complicated and doesn't make a lot of sense the way they have explained it!

Could anybody help me?
I'm currently studying AAT Level 4! as part of my Finance Apprenticeship
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