From my experience as a driving instructor, I know that if you've taken a break from your driving lessons, then you will take some time to get back to the stage you were at before the break, so is there anything that you as a learner driver could do make things a bit easier if you have to take a compulsory break from learning to drive?
Because you can't afford to continue with your practical driving tuition in a car, doesn't mean that the learning process comes to an end. If you haven't passed your dsa theory test, you should make passing that by using your Hazard Perception Study CD Rom, your first priority. If you've passed the theory test, there is still a lot you could do when not taking driving lessons.
Learn as much as you can about what is required by the DSA examiner from you on the driving test. I would recommend you read the DSA's book The Official Guide to Learning to Drive
You might not be able to afford to take driving lessons at the moment, but that should not totally stop you from making progress with your quest to learning to drive and passing the driving test.