My friend has:
SAT: 1400 (700,700)
4.0 GPA
4.48 WGPA
1/124 class rank
SAT BIO 680, SAT US History 600
JROTC Battalion Commander
Crew team unsung hero
Academic Team
Chorus 1 year
Great essays & recommendations
What is his ED chance for JHU?
Not enough info here. Honor/AP classes or hook? Top in class should be very helpful plus leadership role! No need to send the SAT subject tests, particularly the history score, but neither is required anyway. JHU is a reach type school for everyone but based upon what little your “friend” has shared, I would say better than even chance.
10 AP courses and did very well!
Good! Just make sure you have done research on other schools you would be happy to attend (and can afford) and have some applications ready to submit in case the decision does not go your way. Best of luck!