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jinglebells1464646

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Hello
I used to go to Dr DU chem, but now I am switching to Zhangs free trial term 3 hsc revision course because I am looking for harder questions. Is this recommended? Or should I stay at Dr Du or option2 - do lots of past chemitry trials and challenge questions by myself? I feel my chemistry knwoledge and application is fairly solid


I seek expertise from previous Zhang-goers.

Thanks
 

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