631 viewsOctober 8, 2022IB 0 Adnan239 March 25, 2022 0 Comments Karan Answered question October 8, 2022 1 Answer ActiveVotedNewestOldest 0 Karan190 Posted October 8, 2022 0 Comments HL is called the higher level and SL as the standard level. The major difference is that the HL classes require 240 hours of instructional time whereas SL classes can stop with 150 hours. Karan Answered question October 8, 2022 Register or Login