The Agility with Sound learning sequence is as follows:

Level 1: 3 letter consonant-vowel-consonant words
Level 2: As above, plus th, sh, ch, and ing, ed, er and y endings.
Level 3: As above, plus ck, ay, le, et and en endings.
Level 4: As above, plus initial blends, ng, ar, ow, y as in fly
Level 5: As above, plus final blends
Level 6: As above, plus a_e, i_e, o_e, (the silent e pattern), ee and ea
Level 7: As above, plus common vowel digraphs, ai, ou, ew and the like, common prefixes.
Level 8: Alternative vowel sounds, (ou as in soup, i as in obvious); alternative consonant sounds, (ch as in echo, ch as in machine); complex suffixes.

All books in the Agility with Sound series are written to build both decoding and comprehension skills.