My high school moved to block scheduling my senior year, and I liked it better than traditional scheduling. 90 minutes gave more time for in depth discussion, lab work, and group work. I only had 4 classes for homework vs. 6-7. Granted the 4 classes had more work to each of them, but it was faster to complete vs. jumping around to several subjects. I took majority AP classes my last year and had my first year of undergrad done when I graduated high school.