Disclaimer: I used none of the following and base these recommendations off of what I see around the sub.
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For Reading: I hear Erica Meltzer is good.
My personal take: I'd recommend sticking to practice tests and doing deep analyses of your mistakes and all the answer choices (know WHY every wrong answer is incorrect). Reading is a lot less concept-heavy than Writing or Math, so you'll benefit more from exposure to the way the CollegeBoard asks questions. Train yourself from the beginning to look for an answer 100% supported by the text; you MUST NOT introduce outside assumptions EVEN when a question is asking about an "inference" or "suggestion."
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For Writing: Erica Meltzer (if you prefer a very dense writing style) or College Panda (if you prefer something more to the point). Meltzer also has a separate workbook of practice tests.
Know your grammar concepts cold but also realize that this section tests some reading too; you'll need to draw from context to determine the best place to put a sentence, identify the most relevant details, or even determine what word is most appropriate.
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For Math: College Panda ... also has a book of 10 practice tests.
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If you're more of an online resource guy, then use Khan Academy (free) for concepts and Uworld (requires subscription) as a question bank.
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As you learn the concepts for Writing and Math, periodically give yourself real practice sections to see if you can deal with all of them when they're jumbled together and when you do not have the benefit of being told what to look for. Review ALL mistakes thoroughly and identify flaws in your thinking and concepts that need further review. If you're afraid of running out of the tests, maybe use PSATs in the beginning. Feel free to also download the free official SAT Question of the Day App for daily questions.
You can obtain good explanations of practice tests with 1600.io (only first 4 tests are free), or Dr. Roger's Math Neighborhood (100% free, but math only).
I'd recommend not worrying so much with timing in the beginning while you're still practicing, even if you're working with real sections. Time yourself only if you're going out of your way to take a whole practice test. Realize now that making the jump from 1260 to 1500 will require a lot of work on your part, but that it's definitely doable if you have the work ethic.
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Good luck!
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EDIT: Adding the SAT Prep Black book since I see it thrown around every now and then as having good information on how to approach the test as a whole.
Forget about the practice tests. Try reading these 3 books and they're different from those traditional Kaplan/Princeton books cuz this is more effective and to the point. Look at the reviews if you don't believe me.
Reading - The Critical Reader, 3rd Edition: The Complete Guide to SAT Reading https://www.amazon.com/dp/0997517875/ref=cm_sw_r_cp_apa_i_CocTCbC509HKK
Writing- The College Panda's SAT Writing: Advanced Guide and Workbook https://www.amazon.com/dp/098949649X/ref=cm_sw_r_cp_apa_i_jncTCb8VQQDG7
Math - The College Panda's SAT Math: Advanced Guide and Workbook for the New SAT https://www.amazon.com/dp/0989496422/ref=cm_sw_r_cp_apa_i_-ncTCb0K4SM2Y
There's also a dude on this website called 1600.io and he spends a ton of time going over every question on those practice tests you took so he'll tell you the right way to do it. It's free for practice tests 1-4
For one thing, I used a book called "the complete guide to SAT reading by Erica Meltzer". Some don't even know this book but it contains a bit of tips and lots of sat questions. For writing, do college panda writing
SAT reading Erica Meltzer
No I do not have them yet, and are these the correct books from Erica Meltzer?
https://www.amazon.com/Critical-Reader-3rd-Complete-Reading/dp/0997517875
Erica Meltzer's The Complete Guide to SAT Reading Link to amazon: https://www.amazon.com/Critical-Reader-3rd-Complete-Reading/dp/0997517875
<strong>The Critical Reader, 3rd Edition: The Complete Guide to SAT Reading</strong> by Erica L. Meltzer and if needed,
<strong>4th Edition, The Ultimate Guide to SAT Grammar</strong> by Erica L. Meltzer
Websites with lots of free information
The Critical Reader (Erica Meltzer's website)
Reading
The Complete Guide to SAT Reading by Erica Meltzer
Guide to SAT Reading: Global Conversation Passages (free e-book)
Guide to SAT Reading: Literature Passages
Writing (Choose 1 of the books below. They both do an excellent job)
The Ultimate Guide to SAT Grammar by Erica Meltzer
Math (Choose 1)
Overall Book
Practice Tests and Questions
The 14 Practice Tests on this r/Sat
Khan Academy (The 8 full tests are the same as the ones listed on this site and the ones in the College Board's blue Book)
UWorld Some free practice Questions and some paid questions
my top recommendation would be this book: https://www.amazon.com/Critical-Reader-3rd-Complete-Reading/dp/0997517875/ref=sr_1_1?ie=UTF8&qid=1520783812&sr=8-1&keywords=erica+meltzer