Meanwhile, 77.3% of papers received grades between A* and C, which was a rise of 0.6 percentage points on 2014.
Brighton College's 200 sixth-formers had more than 500 A* and A grades between them, including 201 A*s.
The proportion of students getting grades between A* and A declined in seven out of these top ten subjects: Mathematics, English, biology, history, chemistry, physics and sociology.
More than two thirds of GCSEs this summer were awarded at grades between A* and C. That's good news for students – many will now see a clear path to university and a degree – and their schools.
In another shift, the board decided that for now on, no student would be forced to repeat the same grade twice or be forced to repeat more than two grades between kindergarten and eighth grade.
Francis Maude, the Cabinet Office minister, will outline the changes to MPs on Tuesday and will follow the example of Tesco, which has 10 grades between a shelf stacker and its chief executive.
Across all GCSE subjects in 2015 nearly seven out of 10 entrants (68.8%) in England and Wales were awarded grades between A* and C, which meant the rate was slightly up (by 0.2 percentage points) on 2014.
The secreted coatings of protozoans exhibit all grades between soft forms (as in Amoeba) and forms with a cuticle that may be proteinaceous (as in Monocystis) or composed of cellulose (as in the plantlike flagellates).
Overall, the results were also up on last year, with 99.9% of students gaining pass grades between A* to E, while 79% achieved passes at grades A* to B. The principal, Mike Gibbons, told the Yorkshire Post: "These results are the culmination of dedication and sheer hard work and I am very proud of our students.
One idea that, by its very nature, is bound to split opinion is the call from an influential think-tank which said that children born at the end of the academic year should be given extra marks, such is the difference in grades between them and those born in September.
The startup's software allows for real time collaboration around grades between teachers and parents.
