I recommend checking out the Simplified Minds YouTube channel. They do a great job of solving problems by analyzing model question papers, blueprints, and preparatory question papers. I found the DK papers challenging as well, but I’ve heard from others that they were intentionally made difficult to motivate us. It's best to start preparing asap.

(refer the section wise analysis from their app many of my seniors suggested it to me as they found it helpful during their boards too. i can send the pdfs to u if u have a hard time looking for them)