Posted: 2013-09-16 12:16
If I understand you correctly you already know most of the letters/characters and want to learn a few new ones.
Right now I think I'm not doing too bad this way: instead of adding one new letter to the complete set of already known letters, I begin again from start, but with only 3 characters which are completely unknown to me.
When these work nicely, I add all three of them to the set of previously known characters, practise the complete set again and when I'm used to it, I start again with another 3 completely new letters.
Maybe this strategy could help you too? It would focus a lot more on the characters which are new to you, at least.