It depends on the merit of the college and how desperate are you for a seat. If it is a great college and you are extremely desperate to get into a medical college this year, then it may not be too bad an idea.
But I'd suggest you join a college on the basis of your merit, instead of management quota. You could probably take an year off, prepare well and try next year!
All the best!
Amrita Patro, MBBS Kasturba Medical College, Manipal (2020)