In recent years, there has been a clear shift away from the arts, modern languages and some other subjects at both GCSEs and A-levels. Similarly, there has been an 8% decrease in modern languages and more than a 25% decline in English.
Meanwhile, entries in science, technology, engineering and maths (known as STEM subjects) have increased by 15,500, a rise of 6%.
This article is a very good summary of which subjects have been declining and which have been increasing in recent years. There is also some statistical data on how university course enrollments have also been changing.
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