Partially. Basic grammar (tenses, parts of speech) remains same. However, composition exercises (letters, essays) have changed. Buy the edition matching your main book.
You can find digital versions of the solution key on academic sharing platforms or through educational portals: Scribd Solution Key : A common host for the 149-page solution PDF. Minams.edu.pk Answer Keys Wren And Martin High School Grammar Solution Pdf
The standard Key only gives answers, not explanations. However, some regional or pirated versions add notes. For explanations, use a teacher or grammar website. Partially
Spaced repetition is key. After one day, solve only the questions you got wrong. Check again. Partially. Basic grammar (tenses
Yes, under certain conditions: