A friend did his PPL from zero to licence in about six months, and that was probably a record over here in The Netherlands. That included lots of self study, all theory exams, intensive preparation for each lesson using various materials and online videos (that was his own idea by the way) and all the flying. As others have said, it takes time for things to click in your brain and to really 'automate' the needed skills and techniques. If done too quickly, this will not happen fully and you will lose those skills again. Have a think on how often you will fly once you have your licence. If this will be in the region of once or twice per month, have a go at scheduling lessons in this same way and see if you can carry across all you learn from one lesson to the next. Do this for a few lessons and by all means increase the tempo once you feel that you can, but realise that once you have that bit of paper, you will most likely go back to flying once every few weeks and you should be comfortable retaining your skills and knowledge across these once or twice-monthly flights. This is a silly idea perhaps but it might help you.