The old gentleman(ex RAF Spitfire) that taught me used TTMMMPFISCHH and BUMFHH.
B -Brakes check for pedal pressue, big bloody feet moved to heals on the floor and ensure park brake is off.
U -undercarriage down and locked, yes it is C150 but hopefully one day you will flying something bigger and faster that has dangling Dunlops
M-Mixture rich
F-Fuel contents, selection and pumps on if required
H-Hatches secure and ensure seat is locked into position
H- Harness secure.
The old guy had a stellar career in the RAF and survived in GA for many years before doing an instructor rating to see out his final days of flying.
But in nearly 50 years of flying he had seen RAF guys land with feet on brakes, run tanks dry in the circuit area and dunlops not down and locked. While a CP for a charter company a guy succesfully landed a C310 with the park brake . Another pilot who returned to base in the C180 after doing aerial photography to arrive in the flare with the pilot and seat sliding gracefully aft.