98% of students in the Bailiwick of Guernsey achieved a passing grade, with 97.8% of Jersey students and just 97.2% of students in England doing the same.
But fewer school leavers in the Channel Islands achieved the top grades - A* or A - compared to the UK.
This year marks the first time exam boards have returned to a pre-pandemic grading system, with fewer students across the British Isles achieving top marks than at any point since 2019.
Last year, Guernsey had a pass rate of 99.3%, with over 31% of grades awarded being A or A*.
Jersey's 2022 pass rate was 98.9%, with nearly 38% of students receiving an A* or A grade.
This summer's exams were the first external assessments the class of 2023 were able to take.
When the students were taking part in their GCSEs in 2021, exams were cancelled due to the coronavirus pandemic and teacher-assessed grades were used instead.
Carl Howarth, the Principal of Jersey College for Girls, said: “ While the grade boundaries returned to ‘normal’, this cohort didn’t have a 2019 ‘normal’ experience.
"They learnt to work online at home and had not had the benefit of vital exam hall experience and, with their teachers, didn’t have the certainty of where the grade boundaries would be this year."
910 students from the Channel Islands have secured places at one of their chosen universities, according to UCAS figures.
That's down 13% compared to 2022 levels, which was a record year for applications.
Jersey's Education Minister, Deputy Inna Gardiner, said: "I offer congratulations to every single student who has received their results today.
"Our students have worked very hard under very difficult circumstances, through the challenges of COVID-19.
"I would encourage you all to feel proud of your own individual results and wish you all the best of luck in the future."
Deputy Andrea Dudley-Owen, the president of Guernsey's Education Committee said: "This year has yet again demonstrated our students’ tenacity and hard work, as they receive their A-Level, IB, technical exam, and vocational exam results.
"I have no doubt that many students and their parents and carers will have been quite nervous in the lead-up to today, as Level 3 results are a significant step in the education journey before students either move into higher education or the world of work."
Students who didn't get the results they were hoping for are being encouraged to contact Skills Jersey or Careers Guernsey:
Skills Jersey: 01534 449440 / email@example.com
Careers Guernsey: 01481 706565 / firstname.lastname@example.org
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