CHL Handgun QC
You can use the qualification course as a practice course.
The NRA B-27 target is HUGE. To make your practice more relevant, use a smaller target. The B-34 target is a 1/2 scale version of the B-27, and the B-29 is a 1/3rd scale version of the B-27.
(I've been using the B-34 as a standard practice target for 30 years.)
Shoot the Texas CHL QC on a B-34 target and you'll find it much more challenging. Once you get good at that, shoot it on a B-29.
Keep track of which weapon & target you shot and what your score was. Borrow somebody else's gun and shoot through the course a few times.
You can only learn from experience if you pay attention!