The vast majority of the good stuff has been written already, but one thing you might like for what to read back:
If it has "clear(ed)" in it, or numbers that aren't the wind, read it back.
So if you're "clear take off", "cleared into the zone" (contain clear(ed)) or "squawk 1234", "runway 27" "QNH 1013", "contact London 124.6" you read it back. You dont bother reading back "the wind 250 at 15 knots" (the numbers are the wind)
Its not 100% the definition, but "close enough for government work"
Good luck with the test
IFR