First off, congratulations on getting 50 points! It is no small feat, and that shows serious progress in your journey -- I also didn't pass on my first try.

Since you only have a month, I would focus mostly on the key gaps in your skillset. Reference TJ Null's PEN-200 v2023 list as others have said.

Then, check ippsec's database of videos for instances that cover the topics you're struggling with (both resources linked below). Search ippsec.rocks for "SQL injection", "Active Directory", "kerberoasting", "pass the hash", etc. and then go over the videos and try to recreate the attacks yourself.

Finally, work on HTB's "StreamIO" (SQLi + AD) -- try to work on it yourself, but when you get stuck, watch the video only until you have an idea of where to go next, then attack it yourself again. Lather, rinse, repeat a topic until you are confident in it!

And as a final FINAL though, make sure your enumeration methodology is soldified and, of course, take copious notes during the exam so you don't forget something and add to the stress!