Join the PTSA Did you know that over 85 studies, conducted over the last 30 years, prove that children do better when their parents are involved at school? Read more about the benefits of PTSA membership and don't forget you get early access to PROWL registration. When you join Mercer PTSA you will become an integral part of an association of parents, teachers and students not only at your local but also the regional and national level all committed to the success of our students. The membership fee is only $6 per teacher, parent and student ... and additional donations are welcome! Click the Join PTSA Today button.