Did you realize? While studying alone may be simple, studying with a friend, in a group, or for free online with strangers has many benefits. The ideal combination is possible with online study groups that are free.

Below is a list of paid focus groups that are available online:
Survey Junkie
Respondent
Ipsos i-Say
User Interviews
Recruit and Field
PingPong
Google Usability
20|20 Panel
Focus Pointe Global
Mindswarms
Survey feeds

Source: [https://allstudyguide.com/best-online-study-groups/]