Here is my understanding of secondaries. After you get your app verifed and it is sent to DO schools on June 15th, it will take them a week or two to send you a secondary if you meet their cut off.
After you obtain the secondary, you must make the secondary your priority and get it out as if the fear of god was instilled in you. Once you write said secondary very well, you send the bad boy off in email
or mail format (some schools want mail format). Then you hope that you get an interview. Then you hope that you do well at your interview. Then you hope that you get accepted.
Then you start another min of 7 years of schooling in order to achieve your life goal.
ok... i'll stop being dramatic.
tldr; do the secondaries asap