I am used to Edexcel for functionsl skills testing and use the sample online tests a lot. Two series of Levels 1 and 2 can be found with these direct hyperlinks:
Level 1
http://www1.edexcel.org.uk/fs-
http://www1.edexcel.org.uk/fs-
Level 2
http://www1.edexcel.org.uk/fs-
http://www1.edexcel.org.uk/fs-
Two further online sets are available in zipped format on the Edexcel site. I have downloaded these zip files to here:
Level 1
Edexcel Online Test 3 (L1)
Edexcel Online Test 4 (L1)
Level 2