**The following is my experience, LOTS of people do it completely different and still do really really well. So take this with a grain of salt...
Sketchy style learning works great for me, so the following is basically what I did but also includes some stuff I wish I had done.
1. Either pixorize immuno and its anki deck, pixorize biochem and its anki deck, sketchy micro and its anki deck, or sketchy pharm and its anki deck
2-4: work your way through each of these video sets with their decks
**Many of these anki decks include photo links to first aid so read those as you go through the cards
5. Work on something with pathology. Whether that be Pathoma, Sketchy Path (I'm a fan, but its definitely not as good as other sketchy stuff), or Physeo I think just came out with a whole pathology section and Physeo is VERY good with all their stuff, so I'm assuming the pathology will be good too. I'd say pick a reasonable anki deck along with it. By reasonable I mean one that isn't 10,000+ cards unless you can handle that.
6. Hit questions in uworld. Review all answer descriptions and cross reference with first aide. Make a personal anki deck for concepts you are missing
7. Keep up with anki reviews and uworld questions everyday, rinse and repeat
Bonus: I used Physeo for nuerology, and Randy Niel's youtube videos for stats
About your time frame, 6 months is definitely enough time for some people, but with school work you may find you feel really overwhelmed to balance everything. I'd suggest finding a pace that allows you to understand everything AND retain it through anki AND balance your schoo/life. And just consistently day in and day out work that plan. If February comes and you haven't completed everything but have already signed up, then go take it and hope for the best. If it goes well (which it definitely could) then congrats your are done. But if not, you've got an incredible foundation and you will absolutely kill it in August. I see plenty of classmates, myself included, that try and cram for the cbse, skim through things, overlook other things, etc, and take it and do poorly and have to take it again but still not be in a good starting point to study for the next exam.