I hope you like this and will tell me what you really think of it.

Enjoy
"I can’t believe you don’t know what I am talking about . . . what do you mean she’s . . .” This
rip roaring (I agree with Malone, lose the rip roaring) conversation drifted in and out of her conscious mind as she slept, and her annoyance against the person speaking mounted.
Then it abruptly stopped out side her door
(What door? I thought she was sleeping) and she tensed in expectation.
“Ariaaaa . . .” the singsong voice sung as its sound entered into the vestiges of her mind, aggravating her to the depths of her soul.
Why now. . . If only I could kill perfect child now. . argh. . .What is this supposed to be? A thought?
"Oh most annoying one go away from my presence!!” she lifted up
(This sounds kind of like she picked up her eye in her hand and gave it to the evil one, I suggest this becomes 'she looked up to the evil one')her eye to the evil one invading her sleepy presence then rolled her eyes.
I need to be less melodramatic or else I’ll never achieve my goal to be the perfect child for dad. You need to explain in more detail, I for one am very confused.
She buried her head back in the covers. “I’m getting up just gemmy
(gemmy? I think you mean 'gimme') ten.
Ok? (We'll have no text talk here please
:p) ” she mumbled through the blanket covers. The one she was talking to was her younger brother Honami who had black brown hair like her and the same emerald-green eyes except the corner of the her eyes tilted up catlike and her hair was a sleek black and shorter than shoulder length and spiky while his hair was lighter and closely crop to his head.
(Woah, this sentence is a bit long, break it up a bit.) They both looked girly so sometimes they were thought to be twin sisters.
The next thing she knew his arms were around her neck. “If you don’t get up now I’m telling dad everything about your identity at your new school.” He whispered in her ear with a smile in his voice. Suddenly unable to keep in her annoyance and sort of surprised he knew
, she grabbed him and threw him like he was a sack of potatoes across the room. Guess those karate lessons were paying off.
Ok in this paragraph I think you need to use their actual names once or twice, you use the pronouns 'he', 'her', 'she' ect too many times, it gets confusing. This is also a problem in your next chapter.
She got up off the bed and walked across him
(She pushed him over and walked across his body? I think you mean 'stepped over him' if he is still lying on the floor from being thrown, or 'walked past him') to her closet leaving footprints
(Leaving footprints? This doesn't make sense to me I'm afraid.)and got her clothes.
“I going to the bathroom if you dare interrupt me you’ll be dealt with in the same fashion.” She looked at her wimpy girly brother still lying on the floor.
“How in the world can dad prefer you as his son instead of me; I mean I am so obviously stronger.” Sighing she helped pick him off the floor.
“Get up! Don’t be such a girl. Be a man!” He looked up at her in all his cuteness with eyes full of love and respect shining through, but hiding behind it all was a teasing light.
(This seems quite unlikely, I doubt after being thrown across the room and insulted he would be looking at her adoringly, sister or not.)
Looking down at him she sighed. “Whatever. I’ll see you after school and don’t you dare do anything you know I wouldn’t want you to do.
Ok?” With that she walked out the door.
On the Way to School
(A new chapter i presume?)
Riding bike in the morning was cold lots of times but it was a way to make her upper arms stronger therefore
(This sentence makes no sense, you need to rewrite it, I would offer word suggestions but i don't understand what you are trying to convey.) she rode the bike.
I going to be late, she thought angrily
. How come I have to get my self to school and brother gets the royal treatment of a car ride. Father always treats him better. She sighed again.
I really shouldn’t complain and just make myself stronger and show him how good I am.
Lost in her thoughts, she had stopped paying attention to where she was heading and her bike started bouncing. Looking up her heart froze as she realized she had crossed to the walking zone, and before she could think her next thought; she was flying through the air off her bike and hitting the ground. She had landed surprisingly without pain
(This sentence could be improved).
Sitting half way up she discovered why. She had landed on the hottest boy she had ever seen in her life. His black slightly unkempt hair brushed across his face slightly hiding his smoldering blue eyes and in that moment she wished she was dressed as a girl and not in her boy’s uniform.
“Um, are you okay? Or do you need help standing up or something?” He was looking at her uncomfortably. She realized she had left her hands on his chest when she had sat up and was straddling him. She looked back up at his face, his eyes seemed to see straight through her boring into her, and temporarily she forgot everything. Her heart began pounding, and she began to blush. Then she remembered the position they were in.
He probably thought she was weird sitting on top of him and staring at him not to mention it was weird for a guy to stare at you which he would think she was since she had on a boy’s uniform. She groaned mentally.
Time to explain about her uniform I think. Aria’s father never wanted a girl. He only wanted a son. So all her life she had tried being the boy he wanted. When her brother had been born it had seemed her father had gotten his wish but, unfortunately, Honami turned out looking more like a girl than boy and couldn’t stand extreme activities that made him sweat. So to try winning his favor she had started trying to look like a boy and act like one, but he still ignored her.
(You said she was going to explain about her uniform, you should actually put in the explanation as sometimes dialogue can actually explain key ideas well, but subtely. I think you need more dialogue and less narration.)
She decided maybe she did not know enough to be a boy. To learn more about
(being a boy, you don't need this) she started studying harder to get into an all boys school, which was world known for it’s refining of the some of the best men in the world today. Today was her last meeting with the school for making final arrangements in transferring from her old school to this one. It was easier to get in than she had thought it had been
(you will need to explain how a girl got herself accepted into an all boys school) and she didn’t have to worry about her dad asking questions. All he cared about was making Honami a man and so only concentrated on Honami’s schooling.
Since the school preferred their students to live on campus she would be moving in a week to the dorms right next to the school. The only part that made her nervous would be if she had a roommate or not. During the meeting today she was going to tell them her preference of her own room. Author’s explanation is over
(What? Who's Author?).
Realizing she had been silent a little too long she stood the rest of the way up and offered her hand out him. “Sorry, I must have been stunned from crashing into you there for a moment.
(She should be apologizing for crashing into him I think, not for being silent)"
Indifferently he brushed her hand aside. “Never mind forget it.” He stood up and picking up his things continued down the path.
She stared after him. “How rude he didn’t even let me thank him!” Aria mumbled to herself feeling disappointed and slightly angry with him. “He didn’t even tell me his name.”
I can’t believe I got so excited over such a snotty guy.
“Oh, no. I forgot my appointment. I’m going to be late,” with that she zoomed off down the bike path to her soon to be new school.