Forex fees are those fees which are related to the fact that you are changing
money from one currency to another.

There are two different types of them:
a.) The better forex rates (and lower for the customer) are calculated whenever there is a transaction by bank transfer, credit card , cheque and similar means of payment.
Due to the fact that the money is changed by calculation only and not deliverred physically to a cashier's desk they are much better than:

b.) Exchange fees for changing the money. This exhange fee is a bit more expensive for the customers due to the fact that coins and bank notes are deliverred to a cashier's desk, are stored there and "wait" to be changed.

So for nearly every (larger) amount of money it is better to use any type of electronic or cheque transacation. There the "difference" between the sale and purchase of a foreign currency is in the third or fourth digit "after" the point.

And in case of credit cards the fees are calculated on the "better" rate for cheques / bank transfers / payments but the credit card company (Amex) charges about 2 % for use of the credit card in the foreign country.

So this is not so expensive as you think first.

If you study in UK and have your income from any source in US, you have to change this money also from US DOllar to UK pounds. So it may make sense to get a UK based Amex card or to hold the "old" one.

More advice could be given from your card issuer when they now the estimated amount and can calculate that for you.

Hope this helps. Greetings GUM