When exactly can I use my ACT fee waiver?

<p>Today, I went to my counselor for my SAT Subject Test waiver and she suggested I get an ACT fee waiver while I was there. This is only applicable for juniors and seniors, and I'm a sophomore now. But, would I technically be a junior when school lets out in June, allowing me to use the waiver for the June test date? Or do I have to wait until August when I'm actually in school as a junior?
Thanks :)</p>