1) Michelangelo was a mirror writer. It sometimes helps to put a faint X on the left at the beginning of a line so that is where to begin writing..
2) there is nothing wrong with telling a child that 'at' says at . Then take a piece of paper ,fold the length the width of a letter write at all the way down the page not on the fold like this.
at
at
at
at
Then put b,c,f,h ,m in front in a different colour if you find that useful
Then with the fold covering those first letters write p,r,s,t,v read the first list
list with him blending b- at ,c- at and so on . Fold and do the second list.
Read it with him or just to him so he hears b-at ,c-at ,and so on ,say it with him and then offer a chocolate button when he can say them ,with or without blending. Being successful is very important .People remember when they are successful. Use little words and if the school uses qu, ch,sh ,th wh use those asif they are one letter so chat ,that,can join in ,but not what because that says whot! You can build paper- fold lists with these words ,in ,on,un ,and ,
etc. then perhaps words ending in ' ite' for bite kite .white ,mite,quite ,rite
Same with ate ,bate date fate etc. use,fuse,muse,ruse . In fact mix saying a whole word and adding letters to it.? The object is to widen the words he knows quickly. Make it so he hears you do it ,he does it with you as many times as he needs it, then alone .Use lots of praise! Very important.
3) my father had a method that made my grand daughter shriek with laughter and teach him how to read . He was awful at reading so with a well known story like The Three Bears he would read it to her and say the porridge was too sweets,too sour and just like concrete so she had to put him right over and over again because his memory was terrible too. He did that with any story she knew particular phrases .Run,run as fast as you can you can't catch me ,l'm the gingerbread man ,that became a gingerbread biscuit of courses. The local library often have the old favourites.
4) a packet of gold stars is less fattening.
5) if he knows some rhymes ,polite or not ,write them down and make some mistakes! Children insist on the correct words . Have fun! A mistake isn't the end of the world and do it for say 10 minutes only and stop when he's succeeded . End on a high note so he'll look forward to it not dread it.