is it hard to get into top universities with marks around 80's in ug and will I be eligilble for scholarships?
The cutoffs of the top universities will be an important consideration when you think about admissions. Scoring 80's will help you get around 80% and it seems like a good score and will be able to help you get into good university. However, it purely depends on what is the cutoff of a particular university. The same goes for the scholarships. There are universities that will be providing scholarships bases on merits and you can check on the site of the college before applying to see what are their scholarship providing criteria. If you have a particular university or college in mind go through their official website to find relevant information that will help you make better decisions.
Hope this helps.