Two boys from a school in Manchester are among only four in the country to gain full marks in their further mathematics GCSE.
Raymond Ding, 16 and Jamie Horton, also aged 16, both went to Manchester Grammar School and say they were shocked by their achievements.
Raymond from Burnage, said: "I'm pretty happy. It's been a challenging year."
Jamie from Didsbury, said: "I can't believe it. I would never have expected that at all. It's pretty crazy."
Further mathematics is a new GCSE qualification, which is meant to be more challenging.
Lauren Metcalfe who went to Colne Primet High School in Lancashire achieved one A*, four Bs, four Cs and a D.
A Manchester headteacher has launched a scathing attack on Government education policies.
Amanda Thain from Levenshulme High School said low grades for English Language papers are down to the Government altering the way external papers were marked.
Overall, students in the North West had the third highest proportion of top grades in all subjects - recording 12 per cent of A* grades, which accounts for 13 per cent of this year's entries.
But teachers are claiming English Language papers have been marked too harshly.
Students from across the North West will be receiving their GCSE results this morning.
General Certificate of Secondary Education grades have risen annually for the past 24 years.