A bit OT, but as a more experienced engineer who dropped out of school to start a company, I'm curious: why weren't you able to get into your school's CS program?

Don't worry too much about "falling behind". There will always be time to learn more math or a new framework. Worry more about finding that first job, any job, then you can branch out once inside the industry. Networking beats recruiters beats sending a resume, so try to find a friend who already works where you want to be.