How can you fix a wobbly table? i have this brand spanking new table but its so wobbly. I...

i have this brand spanking new table but its so wobbly. I was going to use it as a homework station but immediately i cant because you cant even write on it. How can I fix this?????
Concrete mix?
Answers:    put some metal washers or maybe a block of wood or cardboard lower than the legs of the table....test it out to see what legs are have the problems.
Make a Wind generator - is it possible?
Tighten all the screw and bolts.