How much marks should I get in advanced to get iit in Karnataka

Since you have not mentioned your category, so I'm assuming you to be a general category.

For general category, the seat at IIT Dharwad looking at the past trends

It's ranking is been constantly decreasing because of it's comparitive poor growth and also higher avaibility of seats.

So my take would be you can expect a seat under 7k rank.

Now in terms of marks is really difficult to predict because the paper of JEE Advanced is so unpredictable. Also this year paper is going to be subjective which will further decrease the scoring.

So my safe guess would be to score around 35-38% of the total marks in both the papers.

All the best for your exam