Supposedly this book helps you bridge the gap between the technical source material and the managerial exam. Still on my journey so I can't vouch for the effectiveness.
https://www.amazon.com/dp/1735085197/ref=cm_sw_r_cp_apa_glc_fabc_Q26A6STC3SDKQXRG62Q7
I am using the OSG like you have
Destination Certification mindmaps https://youtube.com/playlist?list=PLZKdGEfEyJhKWyryIvx_jm1jn6ZMTi7gW
Random other videos
https://www.youtube.com/watch?v=\_nyZhYnCNLA&list=PLNNIAvg2bzAGhHvMJmGmLvlQa9oQcy1Iv&index=2
https://www.youtube.com/watch?v=bopYRxAyTU8&list=PLNNIAvg2bzAGhHvMJmGmLvlQa9oQcy1Iv&index=1
https://www.youtube.com/watch?v=2vuHJe-NpA8&list=PLNNIAvg2bzAGhHvMJmGmLvlQa9oQcy1Iv&index=10
https://www.youtube.com/watch?v=wyr7eQVtKlQ&list=PLNNIAvg2bzAGhHvMJmGmLvlQa9oQcy1Iv&index=3
If you have Prime you can do a 30 day trial of Kindle Unlimited and read the how to think like a manager book https://smile.amazon.com/Think-Like-Manager-CISSP-Exam/dp/1735085197/
70% is not bad first time around. The questions are tough. Here's the link: https://smile.amazon.com/dp/1735085197/ref=cm_sw_r_u_apa_glt_fabc_E5ZYV812DZXDMMTS5AE3