Academic types test is for the people who have the motive to study in abroad. And on the other hand General test is for the people who have the motive to work in another country where English is been used as a primary Language. Academic test is a little difficult from the General test.
You must be clear about which test you have to attempt before appearing for IELTS test. Scores are not interchangeable for both Academic and General. For example, if any candidate has a purpose of studying in abroad and he attempts General test instead of Academic, the things will not work it out. So, every candidate should have a clear mindset before appearing for IELTS test that what exactly his purpose is for going abroad.