If you take your car for an MOT and it fails it must be repaired to comply within the MOT standards. If you drive your vehicle without a valid MOT your insurance will become invalid.
The fail certificate will explain what needs to be repaired in order for your vehicle to be classed as road worthy. If you can have your car tested, repaired and then retested within 10 working days then you get a free re-test.
As long as your vehicle is still within its test date you are able to drive the vehicle away from test center, however, it isn’t recommended to drive a car with a failed MOT due to problems that could arise with your insurance. However, if your vehicle fails and flags a dangerous fail then you are not allowed the drive that vehicle any longer until the dangerous fail is rectified.
Your car may have advisory notes. These are issues with the car that at that point in time are not enough to fail but will need to sorted in the near future. These advisories shouldn’t be ignored as it then becomes your responsibility to get these repaired before they become dangerous. It is also a good idea to do them before the next MOT as they may cause your car to fail its MOT the next year.