but only if the child can be assumed to have had the same attitude towards the test as the other

but only if the child can be assumed to have had the same attitude towards the test as the other

你说的句子就是个分局 、哪里有三个从句？
towards the test       as the others 只是状语而已啊 



On the whole such a conclusion can be drawn with a certain degree of confidence

 but only if the child can be assumed to have had the same attitude
（towards the test 状语）as the other (with whom he is compared 介词宾语从句), 
and only if he was not punished by lack of relevant information which they possessed. 
总的来说，得出这样的结论是有一定的把握的，但是必须具备两个条件：能够假定这个孩子对测试的态度和与他相比较的其他孩子的态度相同；他也没有因为缺乏其他孩子已掌握的有关知识而被扣分。