I never wrote that you were a realtor.
Your initial post claims that you have a business in the real estate sector so I thought that you might be interested in studying real estate in business school.
I think that you might want to research courses and careers related to real estate.
Possibly you were referring to the 6% of $600,000 gross amount generated by your business. Maybe you bought & sold a property or other real estate transaction without being a realtor. My point was that generating $600,000 gross receipts/earnings is not the same as $600,000 of personal income.
If your take home part of the $600,000 gross generated was even half, then forget full-time college & concentrate on your business. Colleges will always be available. Consider part-time study while managing your business. Courses can be done on-line or at a local community college.