LinkedIn,Google onsite preparation

Hi, I have a LinkedIn and Google onsite in a couple of weeks. Can anyone let me know how to prepare for these. Im planning on practicing leetcode questions that are tagged LinkedIn and practice a lot of graph, dp, backtracking questions for google. From the previous Blind posts, got to know that google doesn’t ask Leetcode questions. Is this the same case for LinkedIn as well? Also can anyone pitch in System design preparation material apart from educative.io? I recently had FB interview but got a reject, guessing on the fact that my system design interviews were not that great. YOE: 6

Educative: Interactive Courses for Software Developers

Educative: Interactive Courses for Software Developers