With UIL less that 2 weeks away for me, I will "power band" them into oblivion for the 1st 2 days. Play tons - talk little.
We will then sight read more and polish what we need to polish for the final push.
With the metronome, cut it in half. What I mean is if the tempo is 120 - set it on 60 and make them feel the primary beats. If you're in 3/4 time, make it one beat per measure to get them to feel the down beat and float beats 2 and 3. Then take it away. You will be amazed at how they will begin to internalize the pulse better.

Also - with tempo - give them instructions as to where the "motor" is. Direct their ears to where the pulse is driven. This will help them fix pulse and enhance their balance and blend.

Good Luck