People often ask appropriate practice and revision materials for the SATs in May. There are a lot of really good resources out there which are easily accessible. Just make sure they are up to date for the current curriculum and relevant for KS2. Here are a few examples:
CGP Maths SATs Revision Guide
https://www.amazon.co.uk/Maths-Targeted-SATs-Revision-Book/dp/1782944192/ref=sr_1_19?keywords=ks2+sats+cgp&qid=1573059747&sr=8-19
CGP English Study Book - useful for grammar revision in particular.
https://www.amazon.co.uk/English-SATS-Revision-Book-tests/dp/1841461504/ref=sr_1_20?keywords=ks2+sats+cgp&qid=1573060306&sr=8-20
CGP Maths SAT Buster Practice Tests
https://www.amazon.co.uk/KS2-Maths-SAT-Buster-10-Minute/dp/1782942408/ref=sr_1_17?keywords=ks2+sats+cgp&qid=1573060306&sr=8-17
Letts KS2 Comprehension Practice Workbook
https://www.amazon.co.uk/English-Comprehension-Topic-Practice-Workbook/dp/0008294178/ref=sr_1_14?keywords=ks2+year+6+comprehension&qid=1573060567&sr=8-14