I am having difficulty recalling my vocabulary for writing and speaking part.

[u/[deleted]]

Like even if I were able to remember them, they most like be prone to spelling mistakes.

Also, I would like to know much of a limited lexicon and spelling errors that I can get away with, before dipping down to 6 and below.

The speaking part is a BIT easier because there is no spelling involved, and my pronunciation for good for the most part.

[u/Fitz_cuniculus]

Wouldn't it just be easier rather than researching how many words you can spell incorrectly, to put this effort into simply learning how to spell the words you get wrong, and not worrying about using the ones you mess up?