This is the stuff I need to worried about. I’ve been doing residential for four years and we don’t run many circuits for motors. this is something I need to learn how to do.

Are you taking a test for a license that is limited to mostly residential work? If so you may not find as many if any motor circuit related questions.

Experience does help , even more if you are involved in design stages. You could spend a lot of time installing motor circuits but if you only did what someone else told you to do or work off their design, you won't learn as much about how to make selections of materials.

Practice with test preparation materials or other mock scenarios is next best thing. If you don't want to spend $$ on providers of such things you can make up your own scenarios, do your calculating the present things to us on this site (show how you came up with your results) and we can help you figure out what you did right or wrong.

Simple problem to start with might be:

supply volts 480 volts three phase, 30C ambient, all terminations are 75C and all copper conductors having 90C insulation

Motors (all three phase motors) 1 HP, 1HP, 5HP 10 HP.

All motors have 1.15 SF, nameplate ratings are 1.9, 1.9, 6.9 and 13 amps.

One other continuous heating load of 15kW, 3 phase 3 wire 480 volts.

Calculate minimum Feeder size, and feeder overcurrent protection to supply these loads.

For sake of more code usage exercises assume we need to tap the feeder to each branch circuit device and tell us what size feeder tap each one needs (assume all are in close proximity and 10 foot tap rule would apply).

Calculate minimum size circuit conductors for each individual load.

Calculate minimum size conductors needed each branch circuit if all branch circuits were run in a single raceway and then calculate minimum size GRC would be needed to contain them plus the minimum size EGC that would be required to be run with them, also state what size the EGC needs to be.

Determine max allowed overcurrent device using time delay fuses.

For more practice also determine max allowed overcurrent devices using inverse time breakers.

Determine maximum motor overload setting for each motor.

ADD: OK maybe not extremely simple, but needed to get enough variety of things that can apply into one scenario. Look at it as several simple questions all coming from one scenario.