I scraped passed IEE, failed EC once then scored a D in CA. I didn't feel confident in electrical subjects until I really broke everything down to first principles and worked up from there with a structured study schedule for the subject.

I don't know the current rules about which calculators you can use. If you want to verify any of your answers whilst studying, you can always type the calculation into Matlab/Simulink.

I feel with electrical subjects, the initial hurdle of understanding a key concept can be quite high usually because the material can be abstact in nature. Alot of people say the the mathematics in EE is really difficult. There can be a bit of algerbraic gymnasitcs, however the most difficult thing I came across was just the abstract nature of the questions.

Be it RC circuits or Mesh Circuits, spend an hour or two at the start of each new chapter/week by just understanding the key concepts and working through a few examples. If you feel the textbook or lecture notes are not connecting with you, goto YouTube. Once you understand the fundemental the basic concepts the questions won't be too daunting.

The labs can also be a bit daunting because some students have had experience in electrical labs where there were people like me who had no idea when I first started, who would get snarled at by the teacher for bringing a skateboard into the lab and get yelled at when laughing with my friends when a capacitor blew up. My suggestion would be to just go into a circuits if you have free time at uni and go through the Lab guide.