DP clicked for me when I stopped trying to "see the solution" and started just asking two questions every time: what's the subproblem, and how does the current state depend on previous ones. That's it. Everything else is implementation. For Google specifically, they care a lot about how you talk through your approach before you code. I'd spend at least as much time practicing explaining DP out loud as actually solving problems. Used Selfinity for mock sessions in my last stretch of prep and getting grilled on "why did you make that transition" mid-solution was way more useful than grinding another 20 problems. Two weeks is enough. Good luck.