In general, think in terms of students using their energy whenever possible to accomplish necessary or important tasks. This can be as simple as having them stack workbooks to be checked on a pile open to the page to be checked. Or stacking papers to be checked by type. There’s no need for the teacher to spend time opening workbooks or sorting language papers from math papers.
Make or find a penmanship sample guide showing what A, B, C, and D/unacceptable handwriting looks like (based on such items as slant, letters-on-the-line, uniform size and spacing, etc.) Post these samples next to the basket where students turn in their penmanship. Have them evaluate their own work before turning it in by affixing the score they think best fits what they are submitting, when comparing it to the “standards” sample.