While understanding your main objective is to have you child attend schools in the U.S., I think the English standard, as indicated by the low TOEFL score, should be your child's main focus now. We as parents always want our children to attend the best schools in the U.S. but often times ignored the most important consequence of the child struggling to learn because of language difficulty. It is therefore recommended that your child obtains professional English tutoring during this school year and hope the level improves. Having bad grades in U.S. schools will definitely be detrimental in applying to college, which is more important for your child.