What is IELTS for UKVI?

'IELTS for UKVI' is a UK government approved Secure English Language Test (SELT). This means that IELTS can be used to prove your English language abilities in support of a UK Visa and Immigration (UKVI) application.

For many categories of visa, you must submit an English language qualification which is included on the UK Home Office’s list of Secure English Language Tests (SELT tests).

The following IELTS tests are on this list and have been approved for UK Visas and Immigration purposes:

IELTS [ Academic** ]
This test is for test takers wishing to study at undergraduate or postgraduate levels, and for those seeking professional registration in the UK.

IELTS [ General Training ]
This test is for test takers wishing to migrate to the UK and for those wishing to train or study below degree level.

IELTS Life Skills [ A1 ]
This test is for those who need to prove their English speaking and listening skills as part of their application to UK Visas and Immigration for ‘family of a settled person’ visas.

IELTS Life Skills [ A2 * ]
This test is for those who need to prove their English speaking and listening skills as part of their application to UK Visas and Immigration for extension to Family, Spouse or Partner visa.

IELTS Life Skills [ B1 ] 
This test is for those who need to prove their English speaking and listening skills as part of their application to UK Visas and Immigration for indefinite leave to remain or citizenship.

*Please note, IELTS Life Skills A2 is only available in the UK.

**IELTS for UKVI (Academic) is also available delivered on computer in certain locations

IELTS (Academic or General Training)

If you’re applying for Tier 1 and Tier 2 visas to the UK, this is the test for you.

IELTS Academic and IELTS General Training for UKVI are designed to meet certain administrative requirements that are specified by the UK Home Office.

The actual test taken is the same as IELTS (for all other purposes), same content, examiners, format, level of difficulty, scoring and so on.

The difference is in the customer journey on the test day. Test Report Forms will be slightly different, to show that you have taken the test at an IELTS UK visa session.

SOURCE BY :
https://www.ieltsidpindia.com/information/InformationUKVI
http://takeielts.britishcouncil.org/ielts-ukvi/what-ielts-ukvi