If you are the main driver, you MUST insure the vehicle in your own name otherwise you may find that your policy would be invalid. You can only have a no claims bonus on one vehicle, so if your mother already owns her own car, she cannot use her NCB on another vehicle unless she sells the one she currently owns.
Regrettably, any male driver below the age of 25 is considered a VERY high risk and as such you need to prove yourself for the foreseeable future.
You may need to try a pay-as-you-drive policy for the time being.
SHARK!
For every positive action, there's an equal and opposite government plan.