I have recently sent you the results of the last in class open book quiz. please review your answers and see where you may need extra help. I'm willing to assist. and try out these math questions as they relate to ohms law. There are answers to these fyi
Sample test from the bbc
here are some practice questions with explanation
There is a great series of videos on series and parallel circuits from khan Academy. he explains it systematically.
here, he talks about calculating total voltage by adding the voltage drops
https://www.khanacademy.org/science/physics/circuits-topic/circuits-resistance/v/circuits-part-2