Harrow International School Bengaluru will open as a coeducational school for students in Grades 6 to 11 (UK Years 7 to 12) in mid-August 2023. Grade 12 (UK Year 13) will open in August 2024 for those students who have completed Year 12 at Harrow Bengaluru in the preceding year.
Academic Year 2023-24: Standard Age Range
| YEAR GROUP | AGE | BIRTH DATE |
| Grade 6 / UK Year 7 | 11 to 12 | 1 Sep 2011 - 31 Aug 2012 |
| Grade 7 / UK Year 8 | 12 to 13 | 1 Sep 2010 - 31 Aug 2011 |
| Grade 8 / UK Year 9 | 13 to 14 | 1 Sep 2009 - 31 Aug 2010 |
| Grade 9 / UK Year 10 | 14 to 15 | 1 Sep 2008 - 31 Aug 2009 |
| Grade 10 / UK Year 11 | 15 to 16 | 1 Sep 2007 - 31 Aug 2008 |
| Grade 11 / UK Year 12 | 16 to 17 | 1 Sep 2006 - 31 Aug 2007 |
Grade 12/Year 13 will open in August 2024 for students who have completed their first year of sixth-form study at Harrow Bengaluru.