Hello "returning to piano",
Many thanks. That is really good advice. The problem I have,is that I am 60 next year and cannot remember how I used to practice as a schoolboy and a teenager!. I am struggling to remember things that I could once do in my sleep! ie remembering some key signs (minor),the fingering for arpeggios and scales etc, My brain cannot absorb information as well as it could 20 years ago.
Although I find that the more I practice,then the more things come back. Only this week though, after spending a lot of time trying to establish some sort of "system" by which to determine the difference between melodic and harmonic minor scales, I played a full set of white note melodic minors from memory,without having to work out in my mind (whilst playing the scale) the ascending and descending notes and the key signatures.
I think I am thinking to much about trying to get it right,when all I need to do is relax and trust that my long-term memory will kick in.
Your advice to practice just one piece at a time sounds good. Maybe the reason my practice seems so dysfunctional is that I am cramming to much into the hour (or so), therefore putting pressure on myself to do to much,then feeling frustrated when I don't seem to have achieved much.Like you said,,i also find my mind wanders and I cannot concentrate.
I can now go into my next practice with a new,improved, sense of focus.