You can find the test schedule for key skills in chapter 17, section 4 (p446 onwards) of the information manual.   

You can find the test schedule for Adult Literacy and Numeracy Levels 1 and 2 in chapter 18, section 4 (p471) of the information manual.  

Both chapters are available for download from this page if you prefer to view them online.

Notes and errata  

 Key Skills date changes

 Adult Basic Skills date changes