If you have mistakenly selected the Class 7 category and need to leave, here is a detailed guide on how to do so:

**Step 1: Navigate to the EduRev website**
Open your web browser and go to the EduRev website (www.edurev.in).

**Step 2: Find the "Class 7" category**
On the EduRev homepage, you will see a menu or a search bar. Look for the section that displays the different categories or subjects. In this case, find the category labeled "Class 7."

**Step 3: Click on the "Class 7" category**
Once you have located the "Class 7" category, click on it to enter the category page.

**Step 4: Scroll down to the bottom of the page**
Scroll down to the bottom of the category page until you see the footer section.

**Step 5: Locate the "Contact Us" or "Support" option**
In the footer section, you should find a link or option labeled "Contact Us" or "Support." Click on this link to proceed.

**Step 6: Contact EduRev Support**
After clicking on the "Contact Us" or "Support" option, you will be redirected to a page where you can contact the EduRev support team. Fill in the required details such as your name, email address, and a brief message explaining that you mistakenly selected the Class 7 category and would like to leave.

**Step 7: Submit your request**
Once you have filled in the necessary information, click on the submit or send button to send your request to the EduRev support team.

**Step 8: Wait for a response**
EduRev's support team will review your request and respond accordingly. They will likely assist you in removing your selection from the Class 7 category.

By following these steps and reaching out to EduRev's support team, you should be able to leave the Class 7 category and rectify your mistake.