I'll be taking my CDL tests next week in Missouri. During my training at Crowder College,, I have been averaging 92 on my backing and 89 on my road driving. My biggest issue with driving seems to be shifting. The turning and other (non-shifting) skills such as stopping in right spots, braking, lane integrity, scanning, etc., seem to be fine, but I will grind gears a few times or rough shifting. What are the minimum scores needed to pass Pre-trip, backing and the road test?