Phonics Digraph th Spelling Test
I use this spelling test to see if students have learned the spelling pattern 'th' digraph. After the phonics lesson, I have the students fold over the spelling words to the back. I administer the test. Students then unfold the words and self-correct. Any word that is misspelled, they spell correctly along the line 3 times.
You can use the Google Doc link to make your own copy and then change words that might not be the best fit for your students.