So as to 同 Inspite of 點解

意思上so as to即係to~~
The test questions are kept secret so as to prevent cheating.試題必須保密,以防作弊。
The test questions are kept secret to prevent cheating其實都係一樣~~

而in spite of即係儘管的意思~~同despite一樣~~但記得in spite of後只能跟noun或noun phrase~~即係in spite of the rain,i didn't get wet.儘管是那場雨,我也沒有弄濕~~

We often use an infinitive to talk about a person's purpose - why he or she does something. In order to/so as to are normal before negative infinitives. eg. I'm going to leave now, so as not to be late.

In spite of is used as preposition. In spite of + noun means more or less the same as although + clause. eg. We went out in spite of the rain. (=...although it was raining.) We understood him in spite of his accent (=...although he had a strong accent.)
In spite of is the opposite of because of. Compare: She passed her exams in spite of her teacher. (She had a bad teacher.) She passed her exams because of her teacher. (Shae had a good teacher.)
In spite of can be folowed by an -ing form. eg. In spite of having a headache I enjoyed the film.
In spite of cannot be followed directly be a that-clause. In stead, we can use in spite of the fact that. eg. He is good company, in spite of the fact that he talks all the time.
In more formal Engllish, despite of can be used in the same wayas in spite of.

so as to:
in order to (以便)
e.g.: I always keep fruit in the fridge so as to keep insects off it.

Do you mean 'In spite of', i serached a varies of dictionary.
in spite of:
the meaning of 'in spite of' is same as 'despite'
Despite是儘管，例句：Her voice was shaking despite all her efforts to control it. （她的聲音顫抖，儘管她盡全力去控制。）或Despite her lack of interest in physics, she is still very good at it.（儘管她對物理沒有興趣，她這科讀得很好。）in spite of也是儘管，例如：In spite of his age, he still leads an active life.（儘管年紀大，他仍很活躍。）在這裡，把in spite of換成despite也可。