Working

Yes - you must show your workings. If you have made any mistake and you have not shown workings you will get no marks. If your workings show you understand what you are trying to do then you will get marks, even if your answer is wrong.

I was wondering i h ave a habbit in showing my workings first and my final answer underneath. would I get penalise for this????

Not at all - provided workings can be followed. Ideally reference to final answer.