A federal government report from December found that half of all U.S. students started this school year behind their grade level in at least one subject. Many American education experts say tutoring is the best way to help students make up for learning loss during the COVID-19 pandemic. But, although many schools have received a lot of federal aid, only a small number of students have been getting tutored. That finding comes from research by the nonprofit news organization Chalkbeat and the Associated Press. The two organizations surveyed 12 of the nation’s school systems. Eight systems provided information. The schools reported that fewer than 10 percent of students received any kind of tutoring in the fall of last year.