Each school have different centre numbers, it also allows schools to be ranked after the Atars are given out to see how many did well in that school compared to other schools.
I think your school library or your local library would be the best place to find study resources, I haven't seen any papers to practice for year 10 science but going over any past exams that you have done in year 10 will help too and look over the questions you got wrong. Make sure you know...
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Thesis are easy if you understand how to write them. I was taught to read the question that was given to me and define any words that I didn't know the meaning of. Also never use any word from the question in your thesis, go to a thesaurus and find another word that means the same and...