To give you an impression of the difficulty of PLANCKS you can find several sample exercises here. The exercises and answers of PLANCKS 2014 and the exercises and answers of PLANCKS 2015 are also available online.

A diabolo as a yo-yo

A rotating cylinder

Flow in a pipe

Fluorescence from a single molecule

Majorana particles

Molecular spectrum

Maxwell’s insight

Noise

Pour some sugar on me

Thermoelectric transport and heating

Ultrashort electron pulses