You only need 16% efficiency on the hand brake to pass!!

There are self adjusters on the rear shoes. What I normally do (because they don't self adjust very well) is manually adjust them up a click at a time so that the drum only just slips on over the shoes. The hand brake cable must be fully backed off. Once the drum is on, I adjust the hand brake cable up so it only takes about 3 or 4 clicks to put the brake on.