Socrative is an online platform designed to enhance student and teacher digital communications. It does this by offering a questions and answers learning system that can be created by teachers for a bespoke tool. Students share their understanding by answering
formative assessment questions in a variety of formats: quizzes, quick question
polls, exit tickets.

Advantages

• Free for up to 50 students in one room. 
• Easy to use and grade.

Disadvantages

• Quizzes are not available outside the classroom.
• No possibility of peer assessment.

Manual? Please follow this link.