a great way to study for this section is to practice with past years official speaking questions. some youtube channels are actually publishing these. like this channel:
useful phrases for toefl speaking questions
sample answers and format chart for toefl speaking questions:
-there are 4 questions.
-in total, you get 30 points from this section. so 7.5 points for each question.
-the first question has 45 seconds of speaking time. second, third, and fourth questions have 60 minutes of speaking time each.