Reddit mentions of Offensive Countermeasures: The Art of Active Defense

GIAC GSE here and I had successfully pass 4-5 GIAC certification via self-study. I can relate your situation completely since I am exactly in the same situation as you 8 years ago.

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Google up the course authors and buy their Amazon books. Countermeasure Art Active Defense is by John Strand and a course author/instructor for GCIH. The content may be different by underlying concepts is always the same. Buy those books that are written by people who had an affiliation with SANS in a way or another.

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If books by SANS affiliated authors are not available, then get those books with high reviews that are related to the topic you are studying for.

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https://www.amazon.com/Offensive-Countermeasures-Art-Active-Defense-ebook/dp/B00DQSQ7QY

https://www.amazon.com/gp/product/B01M3USWQ2/ref=dbs_a_def_rwt_bibl_vppi_i2

https://www.amazon.com/Cybersecurity-Incident-Response-Eradicate-Incidents/dp/1484238699

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Once you are done with the books, indexed them and buy a practice test to test the book's contents against the exam. Google up any information that the books don't cover and print them out. If you can pass the practice test with those books, then you will do well to pass the exams with those books + google printouts on the actual exams.

Try John Strand
https://cyber-defense.sans.org/blog/2015/06/01/what-you-need-to-know-about-active-defense-and-threat-intelligence
And his book
https://www.amazon.com.au/Offensive-Countermeasures-Art-Active-Defense-ebook/dp/B00DQSQ7QY