catering
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Mathematics and English (if you are in an English speaking country) else the language of your country. If the school provide technical subjects like metal work this also is useful to gain relevant skills
You can learn what is a good diesel mechanic school at web site http://www.mechanicschools.com/ and http://www.indeed.com/forum/job/diesel-mechanic/schools-US-good-schools-Diesel-Mechanic-training/t144829.
other subjects in school dumbo
Yes
acting
wood shop , mechanical,you may think i am nuts but computer so you will know
I assume you mean school subjects. At that level, biology is the most relevant, though you will need to be very good at science in general.
North American Trade School is a good place to start your search for becoming an auto mechanic if you live on the East Coast. North American Trade School has 3 campuses in Maryland.
No high school subjects are career subjects except for opportunity classes. I suggest you take classes in AP math and English. You will need a good command of writing skills and to think out of the box. Get good grades and take part in your student government. Take the SAT and get as good of a score that you can. All of these things will get you in a good college so you can reach your goal.
If you are good with your hands and want to find a job that pays well, you should look into becoming an aircraft mechanic. The easiest route to a job in this field is to enroll in an aircraft mechanic school. There are approximately 170 aircraft mechanic schools in the country that are certified by the Federal Aviation Administration and prepare students for oral and written aircraft mechanic certification examinations.
There are no school subjects required for enlistment in the US Army, however, a good understanding of history (world, European, and American), and government, and good physical fitness are a plus.
When it comes to school subjects, math is definitely my Achilles heel.
perhaps business would be good