DAVID Q said: As far as overlap The 1000 series is 80% based on the 900 series with only a 20% difference, but it may still be in your best interest to stick with the 901 and 902 exams because of the availiability of the study materials. Also you have lots of time to study between now and up until July 31 when the 901 and 902 exams will expire. As of April 2019, all the IT Tech Authors are just starting to come out with material based on the new Comptia Exams update for 1001 and 1002.. Earlier in the year their was no new material based on the 1001 or 1002. I suggest you join Professer Messers study group he goes deep into this subject 900 series vs 1000 series.