Unless you are converting a ICAO ATPL then you are obliged to do a full ground school of 650 hours. (There are reductions for CPL holders as well). This can either be done full time in the class room or by distance learning. You satisfy the face to face component by doing the brush up courses.
I suggest you down load
LASORS
My ref is D1.2 JAR-FCL CPL(A), Modular Course, #3. (it's on Page 133)