You can take online practice tests here. There are several 6th grade tests for all subject areas.
Directions:
1. Once you click on the link above, click on the "Grade" drop down menu and change to 6.
2. Click the "Subject" drop down menu to change the subject to Science.
3. Keep the Year and Program on "All"
4. Hit "Go" on the left.
There are 12 practice tests for 6th grade science. We will be referring to this site more often in the Spring; however, taking a look at it now will give you an idea of what to expect on the TCAP in April.