Training level would never have a circle smaller than 20m.
Reading this test you would ride like this: enter at A, X halt salute, proceed, at C track left, shallow loop H-X-K…once you hit K, you pass A, then at F, you go back across the diagonal to H at which point you are changing directions and are now tracking right.
Between H and C, pick up your right lead canter, make a 20m circle beginning at C, stay in canter until you complete the circle, come up the long side to B, and you make your down transition between B & F.
By time time you reach F your transition needs to be completed, you ride past A, to K go across the diagonal to M, at which point you are now tracking left.
Pick up your left lead canter between M & C. 20m circle begins at C. After your circle continue to canter up the long side to E. Down transition between E & K. Continue on K-A-F.
At F, make a shallow loop from F to X to M.
Continue to C, at which you will make a 20m stretchy circle. Before you get back to C, pick up your reins.
At H, walk. H-E Medium walk. E-F (short diagonal) free walk. F - A (change of direction here) Medium walk.
At A, pick up a trot again,turn down centerline, X halt salute.
Does that help? I find it very helpful to draw an arena, then draw my test. Then some of these movements make more sense.