Preparing CUET and boards.

How did you all prepare for boards and CUET simultaneously as a CBSE humanities student? I'm an above avg student(ig) i scored 85% in boards and 84.8% in 11th. My subjects are English, Hindi, History, Geography, and Economics. I lowkey suck at economics and it's going to be one of my main subjects for CUET. Also, how do you even start preparing for GS???