The best way to test your thinking and find out if your ideas are organised in your mind is to teach. You cannot stand in front of a group of people and tell them something if it is not clear in your mind!
You don’t have to volunteer to run training courses, it could be as simple as explaining a concept to your colleague.
Try using the Feynman Technique to hone your learning, and then make a video of your explanation. You can use the selfie-mode on your smartphone to do a self-test. Another core part of the Geolumina philosophy.