I thought I'd just add to maires post by adding some of the skills required:
Grade 14 is very very basic - Junp on, jump off block for vault, chin ups, leg lifts and pump swings on bars, half hanstand and forwards roll on beam, Handstand to bridge and chasse cat leap on floor.
Grade 13 is similar, moving on to handstand flatback on mats, adding pullover and full swings to bars, cartwheel and half turn to beam, and round off and full spin on floor.
Grades 12-9 basically increase very gentley on these, up to grade 9 - 1/2 on 1/2 off vault, upstart, clear hip to 45 degrees, and yama****a 1/2 undershoot, Flic on beam, pike front dismount and Straight sumi and front tuck walkout on beam.
Grades 8-5 increase the skill level more quickly, including walkover on beam at grade 8, giants and backaway and flic on beam at grade 7, Tsuk or yurchenk prep on two block at grade 6 and a close circle element on bars at grade 5.
The elite levels have much harder demands.
Level 4 (age 9) Upstart, high swings Handspring vault, RO 3 flics headspring, Handspring to one, handspring to two on floor, BWO on beam and cartwheel tuck dismount.
YouTube - Catherine ... British Level 4 Compulsory Routines
Level 3 (age 10) Giants and backaway, Split handstand to flic and cartwheel to BWO on beam FWO, flic to tuck dismount, handspring vault, RO 3 flics tuck and RO flic straight 1/2, handspring tuck.
YouTube - Montage of London Team at level 3
Level 2 (age 11) Front and back giants, clear hip to handstand, Tsuk and yurchenko prep on blocks, Change leg split leap, gainer flic and flic to 1, flic to 2 on beam, double spin, RO whip flic tuck, Straight full, Handspring front on floor.
Hope that gives you some idea and helps!