Are these sentence correct grammatically?

【1】今天早上六点我醒来。

【modified】 今天早上我六点钟起床(get up)      醒来（wake up）

//i don't know you want to say wake up or get up,if your mean is get up,you should say get up,or you should say wake up

【2】我洗澡准备上学了

【modified】我洗完澡准备上学

//your description is blurred，you lost some information about lave,if you tell this sentence to your Chinese friends,you friends can't understand what you say. beacuse they didn't know, you lave before breakfast or after or didn't have breakfast.so i can't  give you the apposite revise

【3】在学校我吃午餐，我读书。

【modified】我在学校读书和吃午餐

//as usual，in China，students always say: i have lunch in school,they didn't say study in school，because study in school is logical

【4】我回家，我看电视。我玩电脑

【modified】我回家后看电视和玩电脑

//i don't know,you are watch tv in what ways,internet or television。or you watch tv first ，and play the computer next？

【5】我哥哥姐姐和妈妈一天吃晚饭，然后我刷牙。我睡觉。这是我的日常生活.

【modified】我和哥哥姐姐还有妈妈一起吃晚饭，然后我完刷牙就睡觉

//when you do something with somebody, you can use "和"

今天早上六点我醒来(maybe you want to say起床？)。我洗澡准备上学了。在学校我吃午餐，我读书（我在学校读书、吃午餐）。我喜欢数学、科学和英语，但我不喜欢音乐或（和）阿拉伯语。我回家后，我看电视。我、玩电脑。我和哥哥、姐姐、和妈妈一天起吃晚饭，然后我刷牙。我、睡觉。这是我的日常生活.。

I´ve corrected the less possible. The suggests made by Yuexi are very helpful in your case.

Are these sentence correct grammatically?

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1、I suggest you to use some associated words ,like “首先”、“然后”、“接着”、“最后”等等，or you can write the time ，例如“放学后”、“晚饭后”、“起床后”等等，to make your article more logical ,not like you just put some sentences together .

2、句式请记住：“someone/something”+“when”+“where”+“do something” ：会议下午在学校举行。

But if you want to emphasize the time ,then you can put the time at the first :下午会议在学校举行。

if you want to emphasize the place ,then put the place at first :学校下午举行会议。

Are these sentence correct grammatically?