The easy questions are aimed at C grade students; these do not require students to rearrange equations or convert non-standard units. The skills involved are identification of the correct numbers to use, correct use of a calculator and correctly method for answering questions.
The medium questions are aimed at B grade students; they involve rearranging equations as well as all the skills needed for the easy questions, there is some application of logic and the need for correct use of standard form and significant figures.
The hard questions are aimed at A students; they not only require rearranging equations, but a wide variety of non-standard units that need to be converted, combining two or more equations and the application of logic, correct use of standard form and significant figures.
Each section has 5 simple calculations in a table format, and then five questions written in exam style. The language used is different in each question (find/calculate/work out/determine) to prepare student for the range of language they will come across in an exam. Each section of 5 written questions gets gradually harder as they go on, to challenge students and encourage them to move on to the next level.