As it is an SEP rating the 12hours in the preceeding 12 months must be on an SEP.
Its not a problem to get rechecked, If it has expired by less than 5 years, which applys to you then all you need to do is renew. Its a 45min/1hr flight consisting of departure, steep turns, stalls, PFL, circuits (flapless,glide and normal) and an EFATO, possible a rejected takeoff.
im sure on the course you will have checks in the single that will allow you to put a stamp in the licence.
Nick