You seem a little confused. In order to revalidate the MEP there is a mandatory test, this may include one sector with the examiner if you do not have 10 sectors as PIC in the validity period of the rating.
In order to revalidate the SEP, you must either pass a test in a SEP Class aeroplane, not so daft because you do not do PFLs in the MEP. However, if you have 12 hours total SEP time in the 12 months preceeding expiry of the rating to include 6 hours PIC and 12 take offs and landings plus a 1 hour flight with an instructor, you do not have to do a test. The Test on the MEP will count as the one hour with an instructor.
Make sure you revalidate before the expiry date or the rating will expire and any experience gained will be null and void. You can revalidate by test up to 3 months early and by experience for the SEP up to 12 months early with no loss of time on the rating.