DS is in the first year of his A levels. Wanted to study a STEM subject at university but wasn't sure what so to keep options open he currently reads for 5 subjects: maths, further maths, chemistry, physics and biology. He now thinks he wants read for engineering at Imperial/UCL/Bristol and wants to drop biology, but this is the subject where he scores the highest marks (around 90% so far in exams). With other subjects it's more of a struggle with scores around 60%. Teachers say biology is his strongest subject and he is better off dropping further maths or chemistry. Offers for STEM subjects at the top universities seem to be so ridiculously high and 2 A start and A in some cases and further maths and chemistry are recommended over Biology. Is it better to keep biology just because he may be able to score better in it?