I need help debugging this code. please explain what is wrong with it step by step.

start Declarations num firstTest num secondTest num average num PASSING 60 output "Enter first score or 0 to quit" input fitstrest while firstTest 0 output "Enter second score" input second averageHll(firstrest + secondTest) / 2 ouput "Average is avgerage if averagePASSING then output "Fail" else output "Fail" endwhile output "Enter first score or 0 to quit" input first endif stop