Reddit mentions of Pass The SIE - 2020 Edition: A Plain English Explanation To Help You Pass The Securities Industry Essentials Exam

I think you should try to bang them out in relatively quick succession but I've only done SIE and 65 (and 3), so I can't confidently speak for the others. The SIE is needed before the 6 and 7 top offs. You could take the SIE, 63, 65, 66 when you are ready and don't need sponsorship, the 6 and 7 both need a firm to sponsor you. Between the SIE and 65, the 65 was potentially harder because it was harder but they seemed pretty similar. I actually studied SIE material to prep for the 65 plus some other material. All the material you need is out on the internet for free in some capacity if you dig deep enough. You'll probably want to do the SIE first because it's required for two others, is cheapest, and is good practice for the 65 (possibly others). What worked for me (on SIE then 65) was to read the book linked, practice, watch related YouTube videos, practice, sit for test. If you pass, your result is "Pass" so no brownie points for getting 100%.

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This was super helpful: https://www.investopedia.com/quizzer/

Same with this - there are practice exams in the book as well: https://smile.amazon.com/Pass-SIE-Explanation-Securities-Essentials-ebook/dp/B0796JZ31L/ref=smi_www_rco2_go_smi_g5171374337?_encoding=UTF8&%2AVersion%2A=1&%2Aentries%2A=0&ie=UTF8

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Good luck!