Civil Rights Movement: A social movement in the United States during which activists fought against racial discrimination and for equal rights under law. This is like students protesting unfair rules at school.
Poll Taxes/Literacy Tests: These were methods used in some states to prevent African Americans from voting before they were outlawed by the Voting Rights Act. Imagine if only students who could pay extra lunch money or pass an extremely hard test could vote - that would be similar.
Section 5 Preclearance: This was part of the Voting Rights Act that required certain jurisdictions with histories of discriminatory practices to get approval before changing any voting laws or procedures. It's like if schools with histories of unfair elections had to get permission before changing any election rules.