Second GMAT Attempt - Official Practice Tests

[FrithjofS541]

Hi folks,
In last autumn I took my first GMAT and was not satisfied with the result, especially the quant score.
Hence, I will retake the exam in two weeks in mid may (in a test center as the online version is rubbish as far as reports go) and was wondering how you can access the free official practice tests for the GMAT. Mine have been marked as used. Do I need to buy the 3rd and 4th test regardless ?
Any info on that would be much appreciated.

TIA and KR
Frithjof

[JohnA712]

information was useful thanks