Do you have any advices for interpretation and level 5 of PETS tests?

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Now,I am thinking about to attend to the interpretation test for middle level and level 5 of PETS,after that,I want to get a certificate of interpretation of high level.I want to get them as soon as possible.At the same time,I have classes in school.Of course,my major is English.My English teachers encourage me to improve myself in this way.But I don't know if I have enough time and the ability to get them while learn my own lessons well.I am busy with them and feel time pass so quickly.Now,my problem is that I am not so confident about the tests.In some way,they are more difficult than my own lessons.If my goals are too many and to high to get?I don't know.