DO NOT TAKE UP CHEAP LESSONS!
Some Driving Schools provide cheap driving lessons because they find it difficult to attract pupils. The old adage "you get what you pay for" is as true in taking driving lessons as it is anywhere else. Don't take up cheap lessons they will just train you slower and end up having more lessons. Why do you think they offer Cheap deals? Its they are not very good.
Get the result you want from CDS.