Will having the e-textbook & flash cards only help prep me for the exam?
I lost access to my certified in cybersecurity course.
It is depends on your experience and basic knowledge too.
As the training course provided by ISC2 is not compulsory for the CC exam, you can study the e-textbook, flashcard to make the basic concept clear.
Good luck for your exam.
If you should be well-verse on the cybersecurity principal in the textbook, and believe practice the questions can brief up the confidence level to attend the exam.