Most schools have largely abandoned grammar, vocabulary, and direct writing instruction as well as complex literature analysis in favor of discussion, feelings, and the use of much shorter selections of text. Newly published works contain shorter sentences and fewer challenging words. So, anything in the traditional sense of English instruction is very helpful in terms of test prep.
(Please do not construe this as advocating for fewer inclusive authors, superiority of white authors, need for fewer representative texts, etc. because these are all positive changes. But there needs to be better balance with rigorous instruction and a more core of materials and at the moment, we don’t have it.)
JHU CTY and Sadlier Connect™ - Bookshelf are good sources for writing instruction.