Don't worry my real DAT scores 5-10 points higher in all sections than Achiever scores. Just make sure you go through all of the explanations when you review your practice tests. CDM is really good to get your timing on point. But if you already have something to practice math with, CDM isn't absolutely essential. Just make sure you time yourself when you practice for QR.
You don't need every single study tool. Just make sure that you fully utilize all of the resources that you do end up getting. I didn't get to finish all of my CDM's, and it feels like a waste. you still have a couple of weeks. That's plenty of time to go through the resources you already have. Just make sure you go full steam until the very end. Don't give up. You're almost there.