Conditional Choices in XLS form

Hello dear members, I am new to ODK and learning it for my next project.
how can I implement dynamic choice in ODK, suppose I have question "in which grade you are studying" based on the answer (it could be 1-13 in my case) I want to show dynamic value set for next question I need to show "A to D" for grade 1-10 and just "A and B" for grade 12 and 13
I am grateful if some one show me a way

Wlecome @chandi on the opendatakit forum. When you get a chance Pmplease take some time Introduce yourself here

What you want to achieve needs you to set the relevant condition for each question or group of question in the survey sheet. For exemple for question A to D :
${grade} <= 10
If you group your questions you can set it for the group only.