That is a great question. I would recommend going through the information like you said, in a linear fashion, starting at the beginning. I would also recommend pairing the course with study materials like:
Mike Meyers All-in-one A+
Exam Cram 1001/1002 A+ Material
You can rewatch the episodes that you need to brush up on. I would also recommend using the CompTIA portion of the ITProTV forums: https://forums.itpro.tv/category/4/comptia if you need support with any topic through your journey to being A+ certified. Thank you for being a member and please do not hesitate to ask questions as they come up.
Knowledge is a road to be traveled upon, not a destination to be reached~~