Please allow me to share with you the following study material information that may help you out.
First its important that you an Ovierview of the CCNA-SP certification and also have the Exam Topics, which you can find in the following links:
For FREE study material and practice you might want to review the following links:
Also the community members here at the Cisco Learning Network have created valuable study guides you might want to check here:
Finally, allow me to share with you a very well written blog by the Certs & Labs Team that could provide you with good insights and further guidance related toward achieving your CCNA Service Provider certification. You can check it out at the following link::
I wish you all the best in your Cisco certification journey.