Dd has exams in 3 weeks. The results will determine if she goes into set 1 or set 2. She's an average student, who underachieves due to a lack of care and attention in her work.
I'm using the BBC Bitesize website to help her revise, we're doing 30 minute chunks of revision then I test her at the end, but she can't seem to retain information. She spent 30 minutes revising MRSGREN for Biology (the 7 things all living things need) then when I tested her, she wrote excretion was use of energy. 
How can I get her to revise more efficiently?