There are many different professional bodies that ask for IELTS score for registration in the industry. These professions can vary from teaching, medical, law or engineering to name a few.
If you are a working professional you have two options for IELTS, with the IELTS General Training and the IELTS Academic tests. You can check with the organisation directly which test is needed.
Some bodies ask for the IELTS General Training test, some require the IELTS Academic test, while there are some that accept both. The IELTS General Training test includes tasks which are related to social and workplace settings, so it is accepted by many vocational training centres or professional organisations.
The Listening, Reading, and Writing parts of the test are completed immediately after each other on the same day. In some test centres, you will sit the Speaking test on the same day, or up to 7 days before or after your test date.
If you take IELTS on computer, the Speaking test will be taken on the same day, either before, or after the other three parts of the test.