You need to do the SEP Class Rating Skill test to revalidate the single rating. There is only one test for such purposes and consists of a departure, two stalls, two steep turns a PFL and some circuits to include EFATO.
For the MEP (Ex Gp B) you need to do the MEP Class Rating Skill test, much the same as in the single but some asymmetric and a 15 minute sector.
To revalidate the FI rating you will have to do a FI Skill Test with a FIE and attend a FI refresher seminar, a two day event.
[This message has been edited by Noggin (edited 04 December 2000).]