Thanks, mdchachi and Lothor. Then Lothor's answer is also (c), (d), (f), right?
(c) Were you and Mike good friends in your high school days?
(d) Were you and Mike good friends back in high school?
(f) Were you and Mike good friends back in your high school?
How about this? Does it sound off?
(g) Were you and Mike good friends in high school?