May 312017 revised CCNA Security practice tests recently. The changes include the following:
1. Additional questions
2. Update to flash cards on some of the existing questions
3. Minor corrections to the question bank
The practice tests consists of features like learn mode and exam mode, exam review, night mode, and several others. The demo version may be downloaded here:

The exam details are given here:

About CCNA Security: The topics included in the exam are as given below:
1.0 Security Concepts 12%
2.0 Secure Access 14%
3.0 VPN 17%
4.0 Secure Routing and Switching 18%
5.0 Cisco Firewall Technologies 18%
6.0 IPS 9%
7.0 Content and Endpoint Security 12%

The topics had been revised thoroughly over the previous version of the exam.

Other tests available include CCNA, CCNP, and CCDA.

Please checkout the website for more information. Official page is given here: