For each exercise, aim to be within 2 reps above or below the rep number suggested.
For example, if it says to complete 12 reps per leg, anywhere between 10 and 14 reps is good (meaning you have reached fatigue within the range of 10-14).
The rest period between exercises is short – this is intended to keep you moving, maintain an elevated heart rate (work in some conditioning!), and be able to build in more volume into your workout time.