Starting this summer, GCSE grades A* to G will be gradually replace by grades numbered from nine to one.
However, around 70 per cent of more than 400 parents and pupils surveyed by the exams regulator Ofqual did not understand the system.
In addition, Ofqual research with 50 human resources professionals revealed that less than half of them understood the new system, while among small businesses, this figure dropped to about a fifth.
This has prompted Ofqual to start a publicity drive to increase awareness, which includes a series of online workshops for teaching staff in schools and universities.
This summer candidates who sit new more challenging English and maths GCSEs will receive a mixture of number and letter grades, and by the summer of 2018 a mix of numbers and letters will be awarded in an additional 20 subjects. The letter system will be entirely phased out by 2019.
"We don't want there to be any surprises in summer 2017. It's really important that we spread the word that GCSE grades are changing from letters to numbers," said Chief Regulator Sally Collier.
Schools in England could face an annual shortfall of £310 million in covering the cost of free school meals unless urgent action is taken, according to a new report led by Northumbria University.
Spending on educational support for children with high needs has risen sharply in recent years, creating unsustainable financial pressure on both local authorities and central government, new analysis warns.
The Always Active Uniform is a flexible, comfortable school uniform including active footwear, designed to support spontaneous movement and daily activity throughout the school day.
The Welsh Government has agreed to continue a licensing deal which will give all learners at Welsh state schools free access to Microsoft 365 at school and at home.
Schools will play a greater role in ensuring every pupil has a clear post-16 destination, with a new approach to a guaranteed college or FE provider place available as a safety net being tested.