Achieve, the company involved in developing the Next Generation Science Standards (NGSS), has released some sample assessment tasks. You can see several middle and high school tasks. They are aaligned with both the NGSS and Common Core Learning Standards (CCLS). Whether or not your state has adopted the NGSS, I think it's a good idea to take a look at them. The NGSS has a great way of approaching science that some teachers aren't used to. If you aren't, or even if you are, familiar with this method be sure to check out these assessment tasks.