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-onscreen-sams2/m1/index.html
http://www1.edexcel.org.uk/fs-onscreen-sams/demo_m1_f/f.html

Level 2

http://www1.edexcel.org.uk/fs-onscreen-sams2/m2/index.html
http://www1.edexcel.org.uk/fs-onscreen-sams/demo_m2_f/f.html

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

Edexcel Online Test 3 (L2)
Edexcel Online Test 4 (L2)