Hello,

As you mentioned you passed HSC with 50% marks in Science. Honestly, I would suggest you not to take the obvious  science streams like Engineering or Medical because it would be very difficult for you to get admission in a good colleges as the minimum in most colleges is 60% for science subjects like Physics , Chemistry, Maths, Biology . If it is ok for you then you should check for degrees in Arts as that would be a bit easier plus a smart option to go for rather than struggling with science.

I Hope I was able to help you.

Good luck