「Can I retake high school in japan and then I’ll study hard to be able to pass the entrance exam in senior high school?」 Are you asking if you can retake high school in Japan, and after you retake high school then try to pass the high school entrance exam? If so, no, you cannot, as you have to pass the school's entrance exam before you begin taking classes there.
「Because they said there’s no entrance exam in high school.」 I'm not sure who you are referring to with "they," but if someone told you that there is no entrance exam for high school in Japan, that is incorrect. Most high schools have entrance exams.
「Is there any special treatment for peeps like me who wants to go in senior high school? like we non japanese speakers will receive a more easy test.」 By "peeps like me," do you mean non-native Japanese speakers, or people who have already graduated from high school in another country and want to enroll in high school in Japan?
As far as I know, no high schools in Japan have an easier entrance exam for non-Japanese speakers. By that I mean they don't have a separate test with easier questions for non-Japanese applicants. You might be able to find a school with an international focus that offers its entrance exam in English, but presumably the difficulty of the questions themselves would be the same as those on the Japanese-language version of the test. There are sometimes schools that have less strict requirements for foreign exchange students, but that's generally only for students who will be studying at the school for just a short time.
As for whether there are ways for people who have already graduated from high school to once again enroll in high school in Japan, no, there are none that I am aware of.
If you don't mind my asking, why are you looking to specifically retake high-school level classes in Japan? If your goal is to educationally prepare yourself to enter a university or junior college in Japan, there are other adult education options available to you, such as attending a language school (to improve your Japanese language skills) or attending a college prep course (to improve your non-language subject proficiency to better prepare for university entrance exams).
On the other hand, if your goal is to get a job in Japan, attending a trade/vocational school would do more to help you in job-hunting than retaking high school will.
Another factor to consider is the social aspect of attending high school after already having graduated in your own country. As you are 18, right now you might mentally/emotionally still feel like a high school student, but consider this. The Japanese school year starts in the spring, so if you somehow did enroll in a Japanese high school, you'd be waiting until next year, when you're 19. As a first-year student, your classmates would be 15, four years younger than you. Using that same age gap, do you, as an 18-year-old, feel like you'd be happy spending all day as the only person of your age in a peer group of 14-year-olds, doing the same-level class assignments and homework that you were doing four years ago all over again? Odds are it will be very difficult to make strong friendships with your classmates, and while your Japanese class might be interesting, the other hours of the day you spend doing math, science, etc. that you already did four years ago is probably going to be boring and unsatisfying.
So to summarize, there probably isn't a path for you to enroll in high school in Japan, but there are adult/continuing education options that are much more likely to be a better fit for you academically, career-wise, and socially.
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