ssvadim

With <a href="http://www.100vadim.com/ssquiz/" rel="nofollow ugc">SSQuiz</a> you can make quizzes really fast. Add questions/quizzes, rearrange questions, edit answers, insert multimedia in questions – all of this can be done on single page within several seconds. Also one can edit welcome/finish/email templates using html if it’s needed. Quiz automatically determines what type of test user creates (choose-correct, fill-blank or question with several correct answers). Once quiz is over, user can walk through their answers and see correct answers.
Features include:
<ul>
<li>Easy and fast quiz creation</li>
<li>Multimedia in questions</li>
<li>Multiple types of questions</li>
<li>Timer</li>
<li>Email sending to user or teacher</li>
<li>Plugin API (See FAQ)</li>
<li>Localization ready (Currently added Russian and Persian translation)</li>
</ul>

SS Quiz

With this plugin administrator can easily and fast create complicated tests and user can't relax, answering this questions.

Rahul Aryan

Zen Projects and Rahul have agreed to team up to bring substantial resources into the development of AnsPress and its related themes and extensions, read the full announcement here: https://anspress.net/blog/anspress-update-annoucement/
AnsPress is an open source, developer friendly, question and answer plugin for WordPress. AnsPress adds a full question and answer system to your existing WordPress site. It can be used to create a Q&A network similar to StackOverflow and Quora, or be a single page on existing site. The plugin supports multiple languages, shortcodes, reCAPTCHA, email and push notifications, and more.
AnsPress is not just limited to questions and answers. It can be used in many different ways, like a bug tracker, an internal Q&A board, support ticket forum, FAQ, and more. Anspress is trusted and used by many popular companies and sites at scale.
Performance and Optimizations:
In our latest release, we’ve made big improvements to performance and have tested the plugin in many different server environments. It has run smoothly on every type of server with minimal impact on load times. AnsPress (including all of its functionalities) is very fast compared to other Q&A plugins. In the latest release we have made major improvements to reduce MySQL queries and to increase the page load speed for all page templates within the plugin.
Developer Friendly:
AnsPress is built with developers in mind and can easily be extended to fit your needs. All parts of the template layouts can be overridden. Our source code follows WP coding standards and is properly commented. We are working on a documentation site which will be available soon.
Contributors:
This plugin wouldn’t be possible without the huge amount of contributions we have received. Check our contributors at https://anspress.net/contributors/
Support and Demo:
We provide support on our site: https://anspress.net/questions 
Our support section uses the actual version of AnsPress, so you can check out the support site if you want to see full working version. 
You can also take the demo site for a test drive at https://anspress.net/demo/
AnsPress Key Features:
<ul>
<li>Submit / Filter / Order / Edit / Delete Question</li>
<li>Answer / Comment</li>
<li>Vote and Select Best Answer</li>
<li>Notification Emails and Web Push Notifications</li>
<li>10+ languages supported</li>
<li>Captcha supported</li>
<li>Shortcodes available</li>
<li>Private/Public for Question and Answer</li>
<li>Ability to Follow Questions / Answers</li>
<li>Featured (Sticky) Question</li>
<li>Closed questions</li>
<li>Flag/report questions and answers to moderator</li>
<li>Basic user profile</li>
<li>BuddyPress integration</li>
<li>More to come…</li>
</ul>
Free Add-ons:
<ul>
<li>Reputations</li>
<li>Tags</li>
<li>Categories</li>
<li>Bad words filter</li>
<li>Email notifications</li>
<li>reCaptcha</li>
<li>Dynamic text avatar</li>
</ul>
AnsPress is frequently updated and more features are added based on feedback from our users. This means you are welcome to give us feedback and suggestions as to what you would like to see or need in the plugin. Visit our Github project https://github.com/anspress/anspress or visit our community https://anspress.net/questions/ to get updates and leave feedback.
Page Shortcodes
Use this shortcode in the base page of AnsPress to work properly 
 [anspress]

AnsPress – Question and answer

Very nice plugins but much work is still needed.

Very nice plugins

A free question and answer plugin for WordPress. Made with developers in mind, and highly customizable.

SS Quiz vs AnsPress – Question and answer