All the available Tests in the market (Kaplan, Arco, 800score, Veritas etc) have different scoring algorithm and that's why they all show you difference in the Test scores. I will suggest that you take the tests from wherever you like for practice sake, however, for scoring assessment, please rely only on the official GMATprep CATs. You may read my debrief at https://www.beatthegmat.com/my-debrief-f ... 54581.html to see in detail my experience with discrepancies in the scorings observed with various testprep companies.

Thanks for the reply becnil, it makes sense to use this tests for practice sake,and I will surely go through your debreif.