Homeschoolers….look on the net for info. Or you can go to a fairly large city and they have school supply learning centers. I finally found a huge 3 inch thick workbook, I can find the name if interested that has everything every grade should be learning.
As far as not getting the alphabet or slow to read etc. My theory is they just are not ready to do that yet, whatever it may be, and wait a while and try again. Like potty training.
If you have a hastings or Borders Books go look at all the choices they have. Honestly my kids learned more by doing than doing workbooks etc. Like baking cookies. They read, do weights, measurements, and follow directions. Then if older they can write a report in their journal. Lots more relaxed, and they do learn. And on top of that the little ones learn by watching the others.