Depends on your other commitments in life. If you have time, then yes it could be enough. You would have to finish the syllabus in five weeks and then start revision/practice the last three weeks.
Learning F5 using the course notes as you watch John Moffat’s lectures is much better than reading the study text. Mr. Moffat’s lectures along with the course notes, and a revision kit is all you need to pass F5. He also has some really good revision lectures as well.