Add punctuation: When piece measures 121212121111 cm inc 1 st in each side
A: When piece measures 12-12-12-12-11-11 cm, inc 1 st in each side.

Add punctuation: The fertiliser quantity also depends on the plants requirements ie the mass each plant forms
A: The fertiliser quantity also depends on the plant's requirements, i.e. the mass each plant forms.

Add punctuation: Allow drvinstexe free download service
A:
Allow drvinst.exe free download service