What English language tests does a Thai partner need to take for moving to the UK?

She needs to do the IELTS Life Skills A1 test (if she's in Thailand). This can be done in Bangkok at IDP or the British Council. If her English is very good, she could do B1 which is more difficult, as this would mean she wouldn't need to take it later for LTR. PM for details if you want. The Life in the UK test won't be required until she's in the UK and applying for indefinite LTR.

B1 test.. In bkk

Correct .Life in the UK.my wife studded for one month and got the books from the library but most of her friends didn't .they used an agency.

Speak to a solicitor or the Home Office website, am sure need to do Life in the UK test as well.

Just googled this mate