Form UX needs to be improved

I have an Assessment Form (located here) which has got 70+ questions and seventeen steps to complete it which is a tedious job and respondent can easlity lose the patience.

All the question has only one Answer (Radio button only). Being that said, I want to modify the Form UX and planning to Group similar questions and use checkmarks so as to reduce the number of questions.

Screen shot of step 1 of 17 in the survey

I am also thinking about having steps available on Left hand side so that it shows related Form with scroll may be. Here's a wireframe to make my thoughts more clear.

Wireframe of grouped questions with progress sidebar

Do you think this will improve the usability of the survey and contribute to a higher completion rate?

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