what subject are you on?
good GOD Electricity and circuits are a pain on the dick. not hard, but looooong.
i remember an especially infamous exercise in a test, i had to convert this energy measurement to Joules, then take the charge, the total number of e~, do some proportional operations with that, wrap that shit back, then convert it again and then do ANOTHER operation with an isolated factor.
the worst part is that the sheet was miserably small.