This is a very simple writing portfolio. Each page is designated for one letter of the alphabet. Students can write and draw words that begin with each letter. For example, on the page that says "I can write words that being with "A".", students can write "apple" and draw an apple.
I would put these in a binder for each student and grade them in the binder, leaving them there for students to review and improve later on. I would mark the task as correct if the student identified 5 words or more on all letters (except x; only 2 would be fine in my book) for lower level students. For higher level, I would look for 10 or more, and accurate spelling.