1.31K viewsOctober 8, 2022IB 0 Adnan346 March 25, 2022 0 Comments Karan Answered question October 8, 2022 1 Answer ActiveVotedNewestOldest 0 Karan303 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 Login