Prepopulating a drop down form

How do I prepopulate the drop down form for bedrooms and bathrooms?

https://form.jotform.com/62388791050157

You can prepopulate your form with prepopulate app: http://prepopulate.jotform.io/ 

You can also check this guide: 

https://www.jotform.com/help/71-Prepopulating-Fields-to-Your-JotForm-via-URL-Parameters 

If I did not understood your question correctly, please explain in more details what you are trying to achieve.

Let us know if you need further assistance.