The test for French is only Tef for Immigration. There is no other way out. Delf is not useful in immigration. I am too Delf B1 pass. However if you speak fluent French just like English, there is no issue in giving Tef. Just learn the pattern of exam. But according to me A2 level is not enough. By B2 level you can connect sentences, know sufficient vocabulary and know all the grammer part of french.