Greetings to you,

The marking scheme of the question type 'more than one correct' varies from examination to examintion. Some of these type of question have partial marking and rest do not. In case there is partial marking, you will be awarded positive marks for every correct option choosen provided no incorrect option choosen. In case there is no partial marking, you will be awarded positive marks only if all the correct options are choosen and no marks if unattempted. Good luck. 

See if you have answered three questions instead of two which you intended to do, so yes ofcourse if your two question answers are correct you will get the marks for each one of them but also if the examination has negative marking for wrong answer then you will lose some marks ie 1 or 2 marks for wrong answer.  I hope it helped