In Task 1 of the Academic version, candidates must describe or summarize information presented in a graph, chart, table, or diagram in about 150 words. In the General Training version, Task 1 involves writing a letter based on a given situation, also within 150 words.
Task 2 requires candidates in both versions to write an essay in response to a prompt, presenting a clear argument supported by evidence within 250 words. Topics can vary widely, covering social issues, environmental concerns, education, and more.
read also - https://www.gradding.com/test-preparation/ielts/syllabus