Test Validity Date and other questions from someone who graduated 8 years ago

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I was suppose to take the NCLEX in March but it was cancelled and my ATT expired.

My validity date extended to April 2021, is that correct? If I request and got a new ATT, can I take the test until April 2021 or is it still 3 months after getting my NEW ATT?

Test Validity Dates From: Jan 29, 2020 To: Apr 26, 2021

PS: I graduated 2012. Maybe being cancelled was a sign because I didn't feel ready, too many textbooks (Hurst, Kaplan, UWorld, npowerment, cram, etc). Is there any advise from anyone who graduated a long time ago and took the NCLEX? How long did you study and what materials did you use?