Some students already take GCSEs early, usually maths and maybe a language such as French.
The committee also questioned the "coherence" of introducing changes to GCSEs before deciding the accompanying national curriculum.
But it rejected the idea that GCSEs were such a "damaged brand" that they needed to be abolished.
Revised GCSEs in academic subjects, including English and maths, are due to be introduced in 2015.
This was widely reported as "Tomlinson turned down", "GCSEs and A-levels to stay" and so on.
In Scotland, pupils take Standard Grades, Highers and Advanced Highers rather than GCSEs and A-levels.
Now they are saying there will be courses worth four GCSEs, but only from 2016.
Schemes involving some GCSEs and national tests for 14 year olds are already being tested.
The Conservatives attacked an "ill-advised announcement" which "risks devaluing Welsh GCSEs and confusing employers".
Today's judgement made it clear that the modular structure created the problem with GCSEs.
Wales' Education Minister Leighton Andrews last week welcomed a decision to retain GCSEs in England.
So, in the wake of the cross-border row on GCSEs, how does he think that's going?
GCSEs will run alongside a revised and "more rigorous" Welsh Baccalaureate, Welsh ministers have said.
He said the percentage of Protestant pupils not achieving five good GCSEs was 42%.
He also wants GCSEs in all other subjects to be ready for teaching by 2016.
Applicants need to be aged between 18 and 57 with a minimum of five GCSEs.
More pupils in the UK are taking international GCSEs, figures from exam boards suggest.
Applicants must be aged between 18 and 57 with a minimum of five GCSEs.
At the moment it is limited to those without any GCSEs above a D grade.
The results of the first Applied GCSEs, worth two conventional GCSEs, came out this year.
He has been adopted by a Cardiff couple, learned English and gained seven GCSEs.
The education secretary should have taken the lead from Wales and regraded this year's English GCSEs.
Last summer 69% of pupils met the benchmark for good GCSEs, easily beating the national average.
Two decades ago its students got about half as many good GCSEs as the national average.
He said many schools offer vocational courses for students who are not going to achieve five GCSEs.
The Department for Education (DfE) said the English Baccalaureate "does not stop any school offering RE GCSEs".
Known as equivalent qualifications, some of these count for as much as four or even six GCSEs.
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Also, some international GCSEs - but only those accredited by the qualifications watchdog, Ofqual - are included.
It is calculated by assessing pupils' best eight GCSEs and so covers a range of their achievements.
These comparisons are with students entering the workplace with A-levels - rather than those leaving after GCSEs.
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