I think @blossom has given you terrific advice.
You’ve set out a very ambitious plan, but I worry that you may be overloading yourself and will end up burning out.
And before assuming your DE science classes from HS will help raise your sGPA, check the AMCAS guide to make sure those classes actually qualify as BCPM credits.[AMCAS Course Classification Guide](https://aamc-orange.global.ssl.fastly.net/production/media/filer_public/e5/68/e5687e03-f55e-4ce6-a4e4-892eaab328dc/amcas_course_classification_guide.pdf)
Coursework in health sciences and things like environmental science or pre-college level mathematics do not.
If you absolutely, positively have to graduate in 3 years, the best course of action would be to drop the second major and use your summers to work (earn some $$$ toward the next year’s expenses) and get your community service hours in.
RE: EMT. Finding a job as EMT may not be as easy as think. In many areas there is a huge surplus of EMT-Bs. Before assuming you can easily get a job as an EMT, you should check the local job market. In my location, EMT earn only $12/hour and many do not work full time. (Employers don’t have to give you benefits if you work less than 30 hours/week.)
And do go speak with your health profession advising office. They will likely be able to give some advice.
I also suggest you go re-read the advice you got in your previous thread–http://talk.collegeconfidential.com/pre-med-topics/2147112-first-gen-everything.html#latest