Learning to use scissors is a complicated activity that requires not only the ability to hold the scissors and open and close them, but a good sitting position and the ability to move the paper while holding it under tension.
If your child is struggling to master scissor control as part of a wider difficulty using their hands, making it difficult for them to manage everyday, consider a referral to Occupational Therapy for an assessment and advice and guidance on things that may help them at home and in school. Specialist scissors made be required for example in the video below: