Česky (CS) 
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5 competition categories exists in real aerobatic:
Primary (also called "Basic"), Sportsman, Intermediate, Advanced and Unlimited.
They differ in their difficulty - figures and number of figures.
To be not so easy there is one more category especially for aircraft Yakovlev Yak-52. The name of the category is "Yak 52". It is something between Intermediate and Advanced. You can fly this aircraft successfully in Intermediate.

Chapter 52 of the International Aerobatic Club, Inc. has very good pages about Categories. There are some Sequences, but we have different in VWAC .

Sequences of categories