Visualizer pie chart is not reading values with 0

I have uploaded a student quiz responses file in csv format which has the data of question strands, student id and student response i.e 1 for correct answer and 0 for wrong answer. I faced 2 issues here,
1) When I tried to create a pie chart, the 1 or correct answers are read but 0 are left out.
2) The pie chart is not grouping variables. If you can observe in the right hand side of the screen link I shared there are multiple questions corresponding to geometry. They are not grouped into a single color with a mild distinction for right and wrong answers(0&1)
All the variables are considered individually, which is of no help to me. I want to group the input data and see how many are correct or wrong.

Similar thing is happening with bar chart as well with only the values of 1 reflected and 0’s being left out.

The page I need help with: [log in to see the link]