CLP: 2020 CDL 300 General Test Q&A plus 50 for each endorsement

Hi guys. Has anyone used this guide and passed CLP at their local DMV ?
It's 300 General Test Questions and Answers plus 50 questions and answers for each endorsements.

https://www.youtube.com/playlist?list=PLgDtmzAnAas1Z1FWSw8wqO-tA1PJj80Iq

I'm thinking this should cover wide spectrum of material and its specific to my state and recent 2020 year.

Many other states are there as well. Let me know if anyone passed with this guide and how smiliar or same is to actual test?

Also what's on CLP test:General questions, Air brakes, Pre Trip inspection ?

Is combination vehicles an endorsement or part of CLP?

So there is 50 general questions on actual test for CLP and how many questions on actual test for each endorsement, for example, tankers. So 50 questions for each endorsement?

Asking cause I'm not sure if i should take it all at once or split it to different days.

I will study this and test myself on this guide: 2021 USA DMV CDL Practice Permit Tests. 99% Pass Rate

Anything else you guys can suggest. Thank you in advance.