Materials calculations and structural stability

Below are the working calculations for the 4 tiers of stone that compose the rockery wall I am designing. When calculating, and just doing math in general I find it easier with a pen in hand and I have to show my working. Math was never a particularly strong subject for me at GCSE, I only ended up scoring a 6 (UK level B) overall, however, when I got to IB and was able to focus on applied maths on the Applications and Interpretations course I saw improvement because it they were visual and tangible calculations. Because of my processing disorder, which falls (debatably) under the category of a learning disability, the speeds at which I process different types of information feel misaligned at times. Calculation pages like these are a way that I can synchronise my thoughts and work them through.