The first time she becomes truly aware about her rebirth is when she is one and a half years old.
She has hit her head after she stumbles on her clumsy feet and it has triggered a rush of memories to her senses.
Afterward, she is never the same again.
She knows that she lived as Haruno Sakura once before and will never forget that.
Now, as Uraraka Ochako, she will do everything she can to get her previous powers back.
And that includes her Strength of a Hundred Seal.
Thankfully, Sakura can still access chakra in this world.
So at an early age, she begins to mold and build her chakra store by starting with leaf training and tree-walking again.
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Sakura is four when she exhibits her gravity quirk.
For days, Sakura has been practicing her quirk in secret before finally showing it to her parents.
The moment arrives when they were all lounging on their back garden one day.
"Mom! Dad! Look!" Sakura exclaims as she presses her fingers together into a triangle and shows her parents her quirk.
A small rock lifts from the ground and remains afloat for as long as she desires.
Sakura's parents beam at her in pride.
"I'm so proud of you, my dear butterfly." Her mother says once Sakura releases her quirk. "Someday you can help us with the construction company."
"But I want to become a Hero, Mom." Sakura protests, looking up at her mother, "I want to become the number one Hero in Japan!"
"And you will sweetheart," her father says, putting a hand on her shoulder. "But first, you must study hard and graduate the Hero course Ochako."
"I will, Dad." Sakura promises. "I will do my best."
And she does.
Like in her old life, Sakura studies hard and becomes one of the top students of her school, which will ensure her path in securing a place at U.A. High school.
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Sakura is six when she begins to practice her medical jutsu once more. She practices by healing her training-related injuries; a few scrapes, sprains and bruises and sometimes broken bones that she set to right. Healing herself is also a perfect solution to hide her extracurricular activities from her parents, especially when Sakura has put herself through a rigorous regimen.
Other than healing her injuries, she also experiments with small animals, whether injured or not. Since Anatomy is an important subject for healing, Sakura starts learning the anatomy of living things, starting with a dead fish before proceeding with other bigger amphibians or mammals. Unfortunately, she can't get a cadaver so easily so Sakura contends herself in relying on her eidetic memory when it comes to human anatomy. It is simply enough to remember.
So for months and years, she relearns everything she has been taught from her previous life, even including the mastery of chakra scalpels.
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She is eight when she successfully cast a genjutsu, the Demonic Illusion: Hell-viewing technique. She does this because she knows she is well-suited to genjutsu-casting due to her perfect chakra control and because there is nothing much to do other than adding more to her skillset.
Since Sakura already has a good grasp of her previous skills to begin with that she is able to improve everything within leaps and bounds. So sooner than she expects, she is able to prolong her genjutsu usage and build her stamina for it.
It takes a year before Sakura can proudly declare that she has an impressive number of genjutsu techniques in her repertoire.
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At the age of ten, she decides to improve her zero gravity quirk as well. She finds out other ways she can use her quirk in the battlefield by creating a mock simulation as much as she can. She also incorporates taijutsu and different battle tactics with zero gravity and everything she can think of to ensure that she wins in any combat situation.
Years passes by swiftly while Sakura trains and studies and builds her chakra. Surprisingly, it is easier for her this time to build her Strength of a Hundred Seal and she is able to use it when no one is looking.
And by the time comes when she is fourteen, Sakura is already ready to head towards the U.A. High school for the entrance exam, where she knows to expect anything.
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Sakura watches as the green haired boy nearly falls flat on his face if she hasn't use her gravity quirk to help him.
"You should be careful," Sakura informs him after releasing her quirk on him. "I don't want a fellow examinee injuring himself before the entrance exams."
The boy turns beet red at her words and Sakura simply ignores the boy's apparent speechlessness and proceeded to walk away from him.
"Hey Deku!" she hears someone yell from behind her and Sakura frowns at the name.
It's an unfortunate for a person to be name as 'Useless' and turns around to investigate as to whom the name belongs to.
Sakura is surprise to see that the name belongs to none other than the boy she helps earlier.
"Deku!" a blonde-haired boy says as he marches towards the cowering green-haired boy.
Sakura watches the oncoming confrontation, but doesn't have the desire to intervene.
"What are you doing here?" the taller boy all but growls out and Sakura nearly steps forward to help the other boy at the sight of firecrackers exploding at the palms of the blonde one.
"I'm here, same as you, Kaachan. I'm here to take the U.A. entrance exam." The green-haired boy stutters in obvious fear.
"Bullshit!" the blonde boy curses out loud before he grabs a hold of the other boy's shirt and –
That's when Sakura finally decides to step in.
Again.
"Hey," She calls out at the two boys, but she especially shoots a threatening glare at the blonde-haired boy as she says. "The entrance exam is about to start. You are going to be late if you two don't stop dillydallying."
Sakura simply watches when the blonde boy glowers at her.
"Time is ticking," She points at her watch and the blonde's face darken even further into a ferocious scowl.
Then, to Sakura's relief, the boy finally let's go of the other boy. For a moment there, she thought that she was about to use her strength to haul the blonde from the helpless boy.
"This is not over yet, Deku." The blonde hisses at the other boy before stalking away, but not without glaring at Sakura's direction.
"Are you alright?" is the first thing Sakura asks as she walks towards the hunch figure in front of her.
"Tha – thank you for helping me. You know…from earlier and also, from stopping Kaachan." The boy stammers, meeting her eyes.
"You're welcome," Sakura says, smiling gently.
There is a moment of silence as the two regards each other.
"By the way, my name is Haru – I mean Uraraka Ochako." Sakura says, holding out her hand for the other boy to take.
She watches as the boy flushes scarlet as he stares at her hand.
"And I – ugh – I'm Midoriya Izuku." He tells her as he reaches out to clasp his clammy hand around hers.
"It's nice to meet you, Izuku." Sakura says, grinning at him warmly while she releases his hand.
"It's nice to meet you too, Ochako." Izuku replies, smiling shyly as well.
"Perhaps we can go inside together?" She suggests.
"Yes – yes, that's a good idea."
"Then, let's go before the bell rings." Sakura says, turning around and began walking towards the entrance to U.A. High school.
"Alright," the boy responds before following after her.