Yes, you should be very good at filling out AMCAS by now.
One of my family friends turned down an acceptance their first cycle during my first postbac year in 2005 (from morehouse actually) because they thought they could do better with high stats (actually higher than the OPs, I think they had ~4.0 and high 30s but applied really late, like September). They had 3 failed cycles (their last one was on my app cycle) and I think he's been doing research to try to improve his app for a couple years; I'm finishing med school in 3 days; if he'd taken that first acceptance he could have almost finished an internal med residency by now instead of being a premed. Turning down acceptances completely f-s you for future cycles.