How do you two grades at once?

You can't literally grade two things at once in the sense of simultaneously evaluating both. Your brain has to focus on one thing at a time for proper assessment. However, you can *efficiently* grade multiple assignments in a session by using strategies that improve your workflow:

* Batching: Grade all the same type of assignment together. This allows you to get into a rhythm and apply the same rubric consistently. For example, grade all essays, then all tests, then all homework assignments.

* Targeted Review: Instead of reading every single word of every assignment, scan for key elements first. Look for the thesis statement in essays, correct answers in tests, and completion of tasks in homework. Then delve deeper into more detailed analysis only when necessary.

* Use a Rubric: Having a clear rubric significantly speeds up the grading process. It provides a structured framework, making evaluation consistent and efficient.

* Break it down: Don't try to grade everything in one long sitting. Schedule specific time blocks for grading to avoid burnout.

* Use Technology: Gradebook software and automated grading tools (for multiple-choice questions, etc.) can help streamline the process and save time.

In short, while you can't grade two assignments simultaneously, effective strategies can significantly increase your grading speed and efficiency.