The last I knew:

SAT: Colorado, Connecticut, Delaware, DC, Idaho, Illinois, Maine, Michigan, New Hampshire, Ohio, Oklahoma, Rhode Island, South Carolina, Tennessee, West Virginia.

ACT: Alabama, Arkansas, Hawaii, Kentucky, Louisiana, Mississippi, Missouri, Nebraska, Montana, Nevada, North Carolina, North Dakota, Utah, Wisconsin, Wyoming.

Also, the implementation of SAT prep is spotty at best. As with most things, whether the schools have test prep is pretty reliant on how well funded the individual district is. At least that's my experience.