My areas of weakness and strength in Chemistry.

My areas of weakness in Chemistry
So far, i have realised that I am not good at showing the relative proportions of the reactants and products involved in terms of the number of moles.
For eg.
MgC02 + 2HCl -> MgCl2 + CO2 +H2O
1 mole reacts with 2 mole to give 1 mole, 1 mole, 1 mole
or 0.2 moles, 0.4 moles, 0.2 moles, 0.2 moles

Another thing that i am not really good at is using the combustion data. The one where the formula given is CxHy(g) + (x+y/4)O2(g) -> xCO2(g) + y/2H2O(l)

My areas of strength in Chemistry
The areas that I am good at is the calculation part and im also good at balancing equations. Another part that i am good at is calculating the percentage yield.