I'm preparing and taking mock tests from past one month and still feel I'm weak in answering the questions correctly. My main flaws include:

-when there is one answer and I mark 2/3 answers.

-Where there are 2 or 3 answers, the first 1/2 is correct.

-I loose the whole meaning of a question when I see a new word which is unknown to me.

I wonder when I can succeed to overcome all this errors.

Please help me with your suggestions.