I have 4 members in my study group. They're not cooperative at all, they're hard to reach and once they did the assignment it's worse. They just copy paste from wikipedia directly. We're doing bachelor degree and we'll graduate soon. What should I do?

You need to find another study group or go it alone. These will hold you back and will ride on your coat tails if you do anything worthwhile.

I hope they edit out the buttons that say "For more information, Click Here" before they submit their work. But, seriously, Wikipedia is notoriously unreliable. It's a lazy person's way of getting inaccurate information.