I need to generate a decision tree for classifying the marks dataset example data set the data set consists of 8 attributes and 1 class attribute out of 8 attributes 6 are subject marks one is total one is percentage  the criteria for class is not  only total marks/ percentage  to be considered but also all subjects marks should be greater than or equal to the pass marks. 

My question is how to train the machine to classify correctly?. As if we know the manual functions in other programming languages . But how to train a machine this type of criteria what method I have to follow. I have to increase the training set data?

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