Even with the right preparation material, evaluating your interview readiness can be a bit challenging. In that case, you can seek external help. One way to tackle this problem is to sign up for mock interview sessions with someone who has experience and knowledge to help you identify your weaknesses.
This could be experienced hiring managers or technical professionals at FAANG. They could also be someone among your friends and peers. This will also give you a comprehensive insight into the interview process and help overcome anxiety with sufficient rehearsals.
If you’re seeking professional help, Interview Kickstart specializes in mock interviews and many other aspects of interview preparation for FAANG.