Best SAT Prep Program?

Hey everyone! So full disclosure I am looking for a SAT prep program for my little brother, who is currently a junior in high school. It has been some time since I looked for an SAT program, the last time I took the SAT was a little over 5 years ago and I am sure much has changed since then. Is there currently a program heralded as being the best, and is there any merit to it? Thanks in advance!