One chooses exercises to develop a horse methodically, not just because they are on a list in a book.
Training level horses should show bit acceptance (light flexion) and do large bended lines (20 m circles) in all the gaits and sustained halts, there could be broken lines, and well formed horses. Spirals (from one end to the other) could be added, and light leg yields. Head to the wall leg yield is a good exercises to get the horse to move off the leg.
First level horses should be 'on the bit', lightly flexed, capable of increased bending (15-10m circles over time), start to lengthen the stride, show square halts (in front at least). LY, broken lines, better formed corners, and some lengthening of strids. Turns on the forehand are also usedful.
Second level is where lateral work (shoulder in/renvers/travers) is added (which is the key to develop collection), there is collected work, and mediums are added. Turns on the haunches are added.
Horses do NOT get bored on circles, and neither should the rider because there should be attention to energy, reaction to half halts, keeping light lateral flexion, keeping reaciton and focus. (And imho if this is a novice horse there should be NO collection asked for as yet.)