Students across Norfolk will collect their GCSE results today. It is the culmination of two years’ hard work and opens the doors to a post-16 education. Here’s all you need to know about the current grading system… GCSEs: a history GCSEs were introduced in 1986 for a handful of subjects, replacing the old O-level system. A year later, all pupils sat the new exams and undertook coursework. At their introduction, results were graded A-G, with a U being ungraded. A pass was considered to be grade C or higher, with A being the highest. An A* grade was introduced in 1994. All change However, in 201…