I'm a sparky by trade, working now for the UK's biggest electrical distribution network and by all means it isn't easy.
You're right about the maths side of it, it's tough. Ohms Law is the very beginning (assuming that's where you're starting). It gets very difficult to learn.. but that being said, once you put yourself through learning it then you will never forget it due to the fact you use it next to EVERY DAY
IMO it's one of those jobs like marmite, you either love it or you hate it, no inbetween. As much as the money is a great thing in this trade, ENJOYING it is even more important. It's a ridiculously dangerous job if you don't understand things, or don't have the attitude, you're gonna hurt yourself or somebody else. I started working on domestic housing and now I work up to 33,000 Volts, and every day requires complete concentration
I'd personally advice you to stick it out for a little longer, purely for the fact I thought the exact same as you when I was training as a teenager. See if you can last another month and then look back to see if you have made any progress, if you have, then fantasic. If not, then maybe think about something else as it is a tough foundation to build. Thinking about your future, electricity is going to be around for a very long time and with the introduction of electric cars it will soon be the 'in' trade to learn as we will be in high demand when shit starts going wrong.
The most important thing is enjoyment, as much as I would recommend what I do to ANYONE, if you don't enjoy it, find something else. Life is way too short to sit back and wonder 'what if'
EDIT: Also, when you're out of training and full Qual. The whole trade changes, what they say to you in a classroom and what you do on site are two completely different things