The National Council on Teacher Quality, an advocacy group, is to issue a study on Thursday reporting that most student-teaching programs are seriously flawed. The group has already angered the nation’s schools for teachers with its plans to give them letter grades that would appear in U.S. News and World Report.

The council’s report, “Student Teaching in the United States,” rated 134 student-teaching programs nationwide — about 10 percent of those preparing elementary school teachers — and found that three-quarters of them did not meet five basic standards for a high-quality student-teaching