<blockquote class="Quote" rel="JETT">Hi All,
Question:
My Student Visa will expire in August 30, 2017.
I need to take PTE in Singapore on July 14 and be back in Australia July 15.
Will this be a problem with immigration? Any idea?
TIA!
</blockquote>
Just for you to be safe, try applying for an extension of your visa beforehand. You could show the immigration proof that you'll have a valid visa when your student visa expires. Otherwise you'll be staying in Australia unlawfully by having a gap if your student visa expires and waiting for your next visa.