There are a number of options you can take once you leave us at the end of Year 11.
You could go to a Sixth Form of a school such as Uckfield, or a Further Education College such as East Sussex College, and study A Levels. These tend to be in academic subjects similar to the ones you have studied in school, such as History. They are called Level 3 courses.
You can also study T Levels at Level 3 in a Further Education College https://amazingapprenticeships.com/resource/what-are-tlevels-film/
Or you could take a Level 3 qualification in a BTEC. These tend to be in much more vocational courses such as engineering.
You can also take vocational courses at Level 2 or 1.
Or you could do an apprenticeship. This is a job, so you get paid, but you also carry on with your training and get a qualification at the end.
Level 1 courses = you get a qualification which is the same as GCSE grades 4-1
Level 2 courses = you get a qualification which is the same as GCSE grades 4-9
Level 3 courses = you get a qualification that is higher than GCSEs.
For more information and a much better explanation look at this booklet from the Greater Brighton Metropolitan College - https://www.gbmc.ac.uk/media/pdf/parents-guide-to-16-19-colleges-and-courses-2020-v-3-4290.pdf
or from the get career confident website - https://www.getcareerconfident.co.uk/parents/what-next-guide