I haven’t used marrow plan C myself, but I guess it’s quite good since the lectures are given reputed faculty.
Since you are still in final year, I would advise you to watch all the videos of the final year subjects and properly take down notes as if it were a classroom course. These notes would be a blessing for you during your internship. This method will also help you cover your preparation for your final year university exams and your concepts would grow stronger. (Mind you, I’m not telling you to replace your textbooks with these notes and videos. Textbooks are your bible for the long run. Those notes would be most useful for NEET PG prep — crisp and concise).
Since marrow provides all videos in small topics, you can try to cover basic sciences by trying to go for an integrated approach. Covering everything might be difficult, but your aim for using this plan should be to make things easier for yourself in internship. Pick up a topic from your final year subject, and watch videos about it’s anatomy, physiology, path, micro, pharmac, and whatever else applicable. And then, of course, solve question banks (which honestly is my fav part about marrow).