I recently started studying the ISC2 Official Study Guide 8th edition and Official Practice Tests 2nd edition. I've just seen now that there is a 9th edition of the Study guide and 3rd edition of the Practice Tests, does it matter if I keep studying the previous editions or should I get the new editions? How big is the difference in content?
Problem is I live in South Africa so I'd need to import the books which will take a couple weeks and will be pricey. I work in System Administration so so far the first 2 domains I am proficient in due to experience.