Depends on your back ground.
If you have done A-level grade school and a technical degree afterwards in some form of engineering. It may.... be a bit less.
But if you haven't looked at a book since school it might be more.
Its better to be more than prepared than nearly prepared. In the grand scope of things if you still earning an extra 3 months is a benifit not a hinderance.
After you have past them of course they are worth bugger all in the grand scope of things. Just a tick in the box.
MJ