Common Core Standards (what you are expected to know in NY state) can be found by clicking on the link below:
http://www.engageny.org/resource/grade-6-mathematics

Practice Exams (2006-2010)
http://www.nysedregents.org/Grade6/Mathematics/home.html 

Past Exams (2013-2018)
 https://www.engageny.org/ccss-library/?f[0]=field_grade%253Aparents_all%3A13526&f[1]=field_subject%253Aparents_all%3A13601