Bad accuracy with my cnc machine

[masinecc]

Ok guys, i really need help with this. Hope some more experienced could give me some advises what to do to get more accuracy with my machine. Here i am sending you a picture from the tests i did.CIRCLES -(1) lower left 10.47-10.70,(2) lower right 10.50-10.60 ,(3)center 9.76-10.90,(4) upper left 10.25-10.40,(5) upper right 10.12-10.70
Every next circle is deeper from the previous one 1-st one 5.4mm-last one gets up to 9.5mm(program is 5mm depth for all cirles, i check my table is parallel )
SQUARES:
1-st square (lower left corner) x=10.35 , y=10.39
2-nd square(lower right corner) x=10.38, y=10.40
3-th square (center) x=10.50, ( this square doesn look like square like the 1-st and the 2-nd one, x=10.50 lower and upper side of the square, Y-left=9.97, Y-right =10.43)
4-th square(upper left corner) x=10.49, Y-left =9.97, Y-right=10.50
5-th square(upper right) i didnt make it coz the tool went too deep in the wood and i was afraid not to broke the tool, but i ques the results would be similar to the 4-th and 5-th.