In case you are wondering, “Task achievement” refers to the relevance of your response to the question, while “coherence & cohesion” refers to the structure of your essay and sentences. “Lexical resources” are the range of your vocabulary, which must include various words if you are aiming for a high band score. “Grammatical range and accuracy” obviously refers to the variety of tenses and how precise you use them.
This task often asks your opinion about a topic, or sometimes you are asked to offer a solution for a problem. You might also be asked to describe the advantages and disadvantages of something, or it might be a discussion about a social subject.
Technically there is no difference between the Academic and General tests as far as writing task 2 is concerned. The question type is the same as described above, but the subject might be simpler in the IELTS General Training, for example, a subject about social trends instead of an academic topic.
Regardless of the test type, you need to be well prepared for the task. The following tips are vital points you should remember and apply in your writing task 2 to get your desired band score. So memorize them and go through them one by one when you are practising. They will become second nature and save you on the actual exam: