Got a call from a Google recruiter, have onsite interviews in 30 days

I needed some help in coming up with a study plan to specifically train for Google's interview process. I currently have 4yoe, so I think the interviews will be for SDE2 role. There will be 3 DSA rounds, 1 Googleyness, and 1 Leadership round. I already have experience in DSA and have solved most of Neetcode 150 (except DP, Bit Manipulation, and some hard problems). If any of you have given Google (or any FAANG) interview before, I would love to get some guidance on how to prepare in 30 days. I already know most of the common algorithms like DFS, BFS, Sliding window, Binary search, etc so I won't have to start from scratch. Also, the recruiter mentioned that I will have only 45 mins to solve two questions: mostly 1 hard and 1 medium. So I basically have around 20 mins per problem, which I feel is very difficult to solve a Leetcode Hard problem unless you have seen it before. Did I misunderstand the recruiter? Are there any tips on how to get good at this?