I don't know if your school offers it, but I took a course called Heart Station (that's what we call our outpatient cards section, stress testing, echo, nuclear, etc). It was predominantly an month spent reading EKGs for half the day. We also had to spend a certain amount of time in the cath lab, the EP lab, stress testing, and a half day a week in outpatient clinic one on one with an attending, but that wasn't the focus of the rotation. We would roll in at 8:30 or 9:00 AM read 10-15 EKGs each from the previous night and then review each one with a cards fellow or an attending. When combined with the other students' ekgs we would see 30-40 a day (and most were abnormal in some way - we threw out the normals). We were typically gone just after lunch, so it was a great schedule too.
I thought it was a great month. We went into great depth with the EKGs, so we learned a lot. Instead of just saying, "that's a paced rhythm" we learned about the different settings, how to determine lead location, common malfunctions, etc. Since I was going into EM the cards fellows really hit SVTs hard (short RP, long RP, fast/fast, slow/fast, and fast/slow AVNRTs, etc) and the different options with them. And I'm only touching on the topics. I did an inpatient cards rotation 3rd year and there just isn't enough time to discuss all these things every day like we did on this rotation, and learning to competently read EKGs is essential to be a great ED doc.
If your school doesn't offer something similar see if you could set something up. A cardiologist somewhere in the hospital reads all the EKGs, so I wouldn't think it would be too much trouble for you to tag along and read some with them.