Eh..., unfortunately I do not know anything about Clinical Biochemistry, but I think that you can use some kind of calculator or formula card in solving different problems because it will be easier. I work as a builder and I always have to deal with numbers, so to find a solution faster, I use the converter from
https://cm-to.com, to convert measured parts for example from centimeters to inches, etc. I hope that my experience will help you in your endeavor as well.