• to correct a test, to correct essays, to correct exercises, to correct papers, to grade papers, to mark essays, to mark exercises, to mark papers
• corrective, remedial, repairer, repairman, repairmen
• amelioration, amendment, correction, darn, doing-up, enrichment, fix, improvement, rectification, repair, reparation
• house of correction, penitentiary, reformatory
• to beef up, to grade up, to upgrade
• to ameliorate, to amend, to fix, to fix up, to improve, to mend, to put in repair, to put right, to refit, to reform, to repair, to set right
• mend, refit, repair, reparation