To be able to answer accurately I need to know:
What licence you have now (does it include C1 or C?)
Do you have any current driver cpc entitlement?
What area do you live?
Where are you in the process? (eg do you have provisional licence)
If you can answer these for me I can give you a firm quote. If you’d rather do this privately, feel free to pm.
All the best, Pete 