Early Beginner level of level 5 of Japanese Language Proficiency Test (JLPT) have roughly 400 to 1,500 characters per book. These books use the same 350 word vocabulary as level 0 and です and ます endings. Early beginner books feature the same vocabulary and grammar as level 0 in longer stories.
Grammar / 文法
present form, past form, interrogative, ~たい, etc.
※ です and ます endings.