How can I show interest in the subject that I want to study?

The Universities that you apply to will want to see that you are interested enough in your course to take the time to look into the subject that you wish to study beyond what you have been taught in the classroom. It should be a concise but honest summary of why you want to study a certain course and the most relevant things that you have done that demonstrate this interest. Studying at university is much more independent and so they want to see that you enjoy the subject enough to motivate yourself to do the work! The main tip is to include the things that genuinely interest you as it is much easier to write an engaging personal statement. You don't need hundreds of examples, but a few well thought out examples go a long way.

In terms of what is included in the academic section, this would be anything that you have done (in your A-Levels, extra reading, work experience, summer schools, personal life etc) that has piqued your interest in an area of the courses that you are applying to. For example, if you are applying for a Politics course, you could include your thoughts on an article you read on Brexit and how it has impacted society. You might also include how a certain area of your A-level studies prompted you to read into a topic beyond the course. I applied to study Theology so included how my work experience visiting a neo-natal unit demonstrated to me the tangible applications of religious ethics and why this was a motivation for studying the course.