Ma'am, can you tell what is the difference between XAMI members and XAT associate colleges ?

XAMI refers to the Xavier Associate Management Institutes and XAT associate colleges refer to all participating institutes, or those accepting XAT scores for admission. While all XAMIs are XAT associate institutes, it is not vice versa. XAMIs are those B-schools which come under the Xavier Trust or the Jesuit Society such as XLRI, XIMB, XIME etc. 

So basically there is no difference between XAMI members and XAT associates on the basis of taking admission, as candidates have to register themselves seperately for each colleges ?

Yes, that's right.

Thank you.