Nick Clegg has said he "wholeheartedly" supports Michael Gove's plans to replace GCSEs with the English Baccalaureate Certificate.
Speaking during a visit to Burlington Danes Academy school in White City, west London, he said:
There are many people who think that if you want to make the system more rigorous, you have to leave some behind, but I disagree.
"I think you can have greater rigour in the exam system, that's a good thing, but also ensure we can cater for all children, the same way the present exam does.
Michael Gove and I have worked closely on this, we are both committed equally to greater rigour in the exam system, yet being inclusive and supportive within the system.
I wholeheartedly support this, I think this is a really good reform.
The GCSE exam for children in England is to be replaced by an English Baccalaureate Certificate with the first courses to begin in 2015.
Education Secretary Michael Gove is to unveil details of a major overhaul of GCSE exams marking a return in part to the old O-level system.