Where to study after pre-licensing to take the exam? (Agent in California)

[Shury Uruiz Stone]

I just finished pre-licensing and honestly I've seen some examples of the licensing exam and I feel like I don't know most of the stuff. Is this normal? I would like to study to prepare but I don't know if its enough with youtube videos which is what I was recommended. Ive seen some websites that give as a service to review for the exam, do you know any that are reliable please?