CB's overview:
https://collegereadiness.collegeboard.org/sat/inside-the-test/study-guide-students
SAT tips:
https://docs.google.com/document/d/13rPjb7VsuMHQ_xazH7nEzo0_cGTs751Vg4wTidChARE/edit
1600.io:
Compilation of books and practice tests;
https://drive.google.com/drive/folders/0B1WNUX-O8FMURVNqZHVMak5Qbm8
Prep books:
https://drive.google.com/drive/folders/0Byxoof4V9z7lbEpHOTFkUzgyWTQ
A quick plan:
https://www.reddit.com/r/ACT/comments/7zhdtl/my_act_prep_plan_for_a_36_or_really_a_plan_for/
SAT Grammar rules:
http://thecollegepanda.com/the-18-sat-grammar-rules-you-must-know/
ACT tips that work for the SAT:
All tests ever published legally:
http://thecollegepanda.com/complete-test-links/
KA (do the daily SAT prep):
SAT Action Plan:
http://www.mcelroytutoring.com/blog-post.php?id=1399&title=SAT+Action+Plan
SAT Math guide:
https://docs.google.com/document/d/1VwW2zHmNJMvv6gJovJHeFSDBTc7P2b-jBNJt2HJgKF0