Do not use tautologies when you write to avoid being redundant.
A tatulogy is needless repetition of an idea, statement, or word. In writing, a tautlogy is often found as a pair of synomous words. For example, "cash money."
Read your manuscript carefully looking for double noun combinations or double adjective combinations. If the two words mean the same thing, remove one of them.
Note the obvious redundancies below that could be corrected by removing one of the paired words:
This secondary physical education curriculum for Middle School and High School students is specifically designed for teenagers 14-18 years old concerning situations faced by this age group in today's society.
This book is for all first responders (law enforcement, fire, or other emergency personnel) who are or want to be supervisors in their agencies. It goes through all facets of good leadership.