Test for women ? Help and Aussie girl out!

G'day Mark 

My names Abi and I'm an 18 yo amature physic builder training for my first comp (session a 2018). 

A lot of the women I train with take test boosters and they claim that it helps with keeping them lean and ups GAINZ slightly however my coach told me I shouldn't need it until 6 weeks out from comp? Yet most other girls are taking it year round without cycling it. 

How does test boosters work in female bodies? Is is bullshit or does it actually do what it claims? 

If so, I'm keen to start a cycle, what brand or type of test do you recommend for females? 

Cheers! 

ITS NOT A GAME