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Hi, Srushti.

Thank you for the screenshots!

I'll try my best to help you troubleshoot, but since this is a question on a custom design, and you're using Javascript, this might be a better question for our community members. 

Problem1: The first slide, it is showing the incorrect answer as there has to be a correct referral answer to grade it.

Since you're using the following slide as the survey question that sends the variable to the LMS, you can remove it from this one. You can do this by going to Insert > Remove Freeform:

 Problem2: The blank slide, it is giving me a Invalid answer popup.

This is a little trickier since you have the javascript trigger, and we're submitting the variable through a separate question. Since this is a survey, my suggestion would be to not have a Review button, or change the settings to only review Incorrect questions. Will you have quiz questions included, or what do you want the users to see when they click the button?

Problem3: I want a question instead of 'short answer' so anyone can easily get idea that this answer refers to this question.

On that slide (1.3), you can change the question name in Form View:

Problem4: If I submit Agree or Disagree for the last question, it shows me false in workday.

You had Feedback by question on your True/False slide, but no feedback layers. You also created a trigger to Jump to the next slide when the user submits. Instead, you want to select none for Feedback, automatically moving the user to the next slide when submitting. You should then delete the added trigger and only leave the following one:

I hope this helps!