Pushing students towards subjects such as science and maths could be counter-productive, it has been suggested.
Dr Mary Bousted, General Secretary of the Association of Teachers and Lecturers, said it risks demotivating children.
Her comments come after the Confederation of British Industry called for a triple science GCSE to be made compulsory for British teens.
"Of course, we fully support pupils who are interested in science studying three science GCSEs, but it would be counter-productive to make it compulsory for those who have no interest in studying three sciences," Dr Bousted commented.
More than 600,000 students will receive their GCSE results later this week, with education experts predicting that the number of students achieving top grades will rise again.
In related news, it was revealed last week that there has been a rise in candidates sitting A-level exams in chemistry, biology and physics.
Posted by Katy Kearns