This is what ChatGPT tells me. Bear in mind it not be 100% accurate but definitely a good place to start
Of the A-level subjects you listed, Chemistry (AQA) involves very little essay writing. Most questions are calculations, structured short answers, and some longer explanations, particularly for reaction mechanisms or trends. The longest responses are typically six-mark questions that require clear explanations rather than full essays.
Computer Science (OCR) also has minimal essay writing. The majority of the course focuses on logic, programming, and problem-solving. While there are some extended-response questions, particularly on ethical and societal issues, these tend to be concise rather than essay-style. The Non-Exam Assessment (NEA) requires a written report, but it is more technical than a traditional essay.
Geography, whether Edexcel or Cambridge International, is the most essay-heavy of the four subjects. Case study-based questions often require extended writing, with answers worth between ten and twenty marks. Edexcel tends to have more essay-style responses, while Cambridge International features shorter, more structured questions, but both involve significant written analysis.
Physics (AQA or OCR) is largely calculation-based, with minimal essay writing. While there are some extended six-mark questions, they require structured scientific explanations rather than essay-style responses. OCR may have slightly more long-answer questions, but neither exam board includes true essay writing.
Overall, Chemistry, Computer Science, and Physics are relatively essay-free, while Geography, particularly with Edexcel, involves more extended writing. If avoiding essays is a priority, Geography may not be the best option, whereas the other three subjects should be manageable.