The reason a student school start early is because the student can retake them many times in order to get a better grade. Be aware that they testa cost $50 each and they are only available a few times a year.
Begin lookimg at scholarship programa at the end of junior year to see what is out there and get application deadlines. Some applications are due early in the senior year while other aren't due until the senior's spring semester.
Some state also after scholarship and financial assistance. Look into those since in some cases, once a student leaves high school without apply,the state assistance is lost to them for good.
There are anymore of local scholarship programs that your student's guidance counselors would know about. There are many community ,religious or retail scholarship that go unnoticed each year.