THis is always tough when looking at a high schoolers tape... The fact is, most high school quarterbacks go through a read or two at most. The defenses aren't exceedingly complex. Most high school qbs are taught to key the safeties and quickly identify coverages. Based on what coverage they read they throw the ball to the target of their choice. Its not like you see some **** Lebaeu zone blitzes in high school. A HS coach may argue this point a LITTLE bit but i'd say the vast majority make one or two reads and throw/run. for example, in high school a qb may receive the snap, drop back and watch the strong safety and give a quick glance at the free safety, if both drop into deep zones its is likely a cover 2 so he might throw the post over top of the middle lineback and between the two safeties. the game gets considerably more complex at the college level where they are expected to make more reads against higher quality defenses.