Ruby didn't cry about it. She'd buried a husband, a father, and a son. She wasn't going to cry over a six.
But that night she sat at the kitchen table long after Kenzie's mother had picked her up, and she opened the green book to Chapter Six and looked at her own pencil marks from 1958. She'd stopped halfway down the page. A problem about two pipes filling a tank.
She worked it. It took her twenty minutes and three tries, and she got it right.
Then she turned the page.
Kenzie didn't go home and sleep that night either, though Ruby didn't know it until later. Kenzie went to school the next morning and walked into the principal's office before first bell, which she had never once done on purpose.
Dr. Ray Whitt was fifty-one, and he'd been principal at Cumberland Ridge for nine years. He was eating a biscuit at his desk when a senior with a forty-eight-turned-sixty-eight in Algebra Two sat down across from him and said, "My great-grandmother needs help, and she's too proud to ask."
She told him the whole thing. The deal at the kitchen table.
The practice tests. The six.
When she said the name Ruby Cantrell, Dr. Whitt put his biscuit down.
"Ruby," he said. "From the cafeteria."
"She cooked here thirty years."
"I know she did." He looked out his window toward the parking lot for a minute before he went on. "Spring of 1987, the shirt factory in town closed, and my daddy lost his job. I was in tenth grade. We didn't have lunch money, and I wasn't about to sign up for the free lunch where my friends could see." He shook his head. "Every day for the rest of that year, Miss Ruby put two trays in front of me and charged me for one. Except she never charged me for the one. And on Fridays there was a paper sack of rolls on the end of the counter with my name on it."
Kenzie hadn't known any of that.
"She never said a word about it," Dr. Whitt said. "Not to me, not to anybody I ever heard of."
He picked up his phone. It took him most of that morning.
The county office couldn't move its June date, but the adult education director in Knoxville had a Saturday session at a testing center on May eighth, and a man had dropped out of it. There was one open seat.
"You tell her I'll drive her," Dr. Whitt said.
Ruby, when Kenzie told her, sat very still.
"I don't want favors," she said.
"It's not a favor. It's a seat. You still have to pass it." Kenzie set her own Algebra Two book on the table, next to the green one. "And so do I. My final's on May thirteenth."
That gave them sixteen days.
They studied like two women filling sandbags. Ruby made coffee at 3:30 so it would be ready when the bus stopped.
Kenzie put her phone face down on top of the refrigerator, where Ruby couldn't reach it and Kenzie wouldn't. They did problems out loud, and when one of them got stuck, the other one had to explain it.
Ruby's trouble was the calculator. She didn't trust it. She'd work out the answer in her head, then punch it in, then check it against her head again, and the test was timed.
"Mamaw, you're doing every problem twice," Kenzie said.
"I'm checking my work."
"You can check it at the end. Do it once, mark the ones you're not sure about, and come back."
Ruby frowned. Then she nodded slowly. "That's how I did the trays," she said. "You fill the whole line first. Then you go back and fix the ones that look light."
Kenzie's trouble was the word problems. She panicked when there were too many words.
So Ruby made her read each one out loud and stop at every number and say what it meant in plain English, the way Ruby used to read a recipe before she'd ever pick up a spoon. Once Kenzie could say it, she could write it.
On the morning of May eighth, Dr. Whitt pulled into Ruby's gravel drive at six o'clock in a clean pickup. Ruby came out in her church dress with two sharpened pencils in her purse, though she knew perfectly well they'd give her new ones.
"Morning, Miss Ruby," he said, and got out to open her door.
She looked at him over her glasses. "You're the Whitt boy. You liked the chicken and dumplings."
"Yes, ma'am. I still do."
They didn't talk much on the ninety minutes to Knoxville. At the testing center he walked her to the door and told her he'd be in the parking lot, however long it took.
Ruby sat down in a small room with a computer screen and a gray calculator. She filled the whole line first.
She marked the light ones. When she was done, she had eleven minutes left, and she went back and fixed two.
The scores came on Wednesday, the same week as Kenzie's final. Kenzie read them off her phone at the kitchen table, standing up, one hand pressed on the oilcloth.
"Math," she said, and her voice broke right in half. "Eleven."
Ruby put her hand over her mouth.
Kenzie took her final the next day. She came off the bus at 3:40 and didn't say a word, just walked into the kitchen and held out a sheet of paper. A seventy-nine.
Her grade in Algebra Two came out a seventy-one. She'd walk.
The county school board met the following Monday. Dr. Whitt stood up and asked for one item on the agenda.
Tennessee had already given Ruby her state equivalency diploma. Dr. Whitt asked the board to give her a Cumberland Ridge one too, and to let her walk.
The vote was five to nothing.
Graduation was held in the gym on May twenty-first, because it was raining. The bleachers were full, the floor fans were humming, and a hundred and twelve seniors sat in folding chairs in blue caps and gowns. Ruby sat in the last chair of the last row.
Her gown was too long. Kenzie had hemmed it with safety pins.
When they came to the end of the list, Dr. Whitt stepped up to the microphone.
"Our last graduate," he said, "was a member of the class of 1960. She left us in March of 1958, to run her family's dairy. Then she came back and fed this school for thirty years. Tonight she's a member of the class of 2027." He looked out at the bleachers. "Ruby Mae Lawson Cantrell."
The gym came up off the bleachers.
Ruby walked across that stage slowly, on bad knees, holding the rail. She shook Dr. Whitt's hand and took the blue folder. And from the front row, a seventeen-year-old girl in a cap and gown was standing on her folding chair, screaming her name.
That night, Ruby took the green algebra book down from the shelf one last time. Under Ruby Mae Lawson, Room 12, she wrote in a careful eighty-five-year-old hand: Finished, May 2027.
Then she gave it to Kenzie.