No -it is not necessary to have taken biology and chemistry in the last 10 years, but we suggest students take at least 6 weeks or more to review.
For anyone who has been out of school for more than 3-5 years, we highly suggest you take a minimum of 6-weeks to study for the ATI TEAS Exam. Not only will that preparation help you pass the ATI TEAS, but it will also prepare you for the rigors of Nursing and Allied Health School. Most institutions will expect you to know these topics and be ready to expand on that base level of learning.
Below is the breakout of what will be on the ATI TEAS, Version 7 exam. And these are the topics and weighting that our schools have deemed most important to assess for entry-level students.