It's like passing a driving test. Do everything slow and exaggerated, and narrate what you're doing. Keep an eye on your instructor, they'll probably be giving you little cues.

Remember, kids take the same PAL course adults do, and they pass it all the time. Don't point the test firearm anywhere you're not supposed to, keep your finger well away from the trigger and trigger guard, be able to rattle off ACTS/PROVE, and for the multiple choice tests, whichever answer is the most overly-cautious, in terms of safety, is probably correct.

The test is designed to let people pass it. You really need to be either completely and obnoxiously not paying attention and half-assing it, or be an utter moron to fail.