The minimum score to pass the AWS cloud practitioner exam is 700 out of 1000 i.e. 70 percent. You will have 65 multiple choice questions and the duration of the exam is 90 minutes. I would suggest spend 30-35 seconds for each question and come back after completing all questions to check again. Read and understand the question clearly because a single word can totally change the context of the question.
In case you are preparing for AWS cloud practitioner certification, I suggest this AWS course by Intellipaat.
You can watch this video on AWS Cloud Practitioner to get a quick start for your preparation: