Before Jeff altered his own education there was someone he had to take care of first.
His older sister Janet had been a thorn in his side for years. At 21 she was 3 years older than him and was currently attending their local university. Jeff had hoped she'd go away for college but she was here at home still snitching on him at every chance.
Jeff remembered just a few weeks ago getting caught sneaking out to go to a house party thanks to his sister's snitching. That had cost him use of the family car on the weekend.
His parents adored Janet for her flawless school work. Being valedictorian of her year and getting a full scholarship for college and winning awards. She'd had straight As since 1st grade and had rubbed it in Jeff's face when he had more average results. His parents made constant comparisons between him and her academically, and this deeply grated on Jeff.
Now he had the power to change things with this package. First thing he did was change Janet's education status, he changed it from college junior to Highschool freshman.
This did update Janet's status she was still in all AP classes with straight A's the only thing that had changed was she started Kindergarten at 12.
That wasn't good enough for Jeff. He lowered her grades to Ds and Fs, he changed what classes she was in too, putting her in remedial classes for the Ds and keeping her advanced classes for the Fs.
He also adjusted how she moved through the grades. She started Kindergarten at the normal age but had to repeat it three times. She progressed normally through elementary school with straight Ds then Jeff had her repeat each year of middle school.
For fun Jeff deleted Janet's driving knowledge making it so she could never learn how to drive a car. He raised the age she learned to talk to 8. He adjusted things so Jane hadn't even started toilet training until she was 13 and was still struggling with day time accidents.
Satisfied with his revenge Jeff applied his changes and let the Chronviac work its magic.