Children develop at their own rate, but here is a list of skills for what most children are able to do by the end of grade levels from kindergarten through fifth grade.
This webpage offers apps for a variety of speech/language skills, including articulation, following directions, phonology, social skills, wh questions, and word retrieval. Check it out!
Teach Me To Talk is a website that delivers weekly podcasts on specific language skills, such as initiating conversations and using gestures, to imitating and following directions. Such a good resource!