If your goal is to create lessons using a full-featured editor, rather than the clunky web-based lesson editing interface in Moodle, then you could consider using the Microsoft Word file Import/Export (Lesson) plugin to create the text content pages, and the Microsoft Word file Import/Export (Question) plugin to create the questions. The question plugin uses a structured table in Word to contain each question, not the GIFT format. The lesson plugin allows standard narrative text (including images, tables, etc.) in Word, and uses headings as delimiters to decompose it into separate pages in the lesson.
Ideally, the Lesson plugin should import both questions and text so that they could be kept in a single Word file, but unfortunately this is not possible (as yet). Once imported, you still have to stitch the pages and the questions together in the logical structure that you want, as they initially form what is essentially a long linear list.

1. Create groups and include them in a grouping.
2. Go to the Quiz/Assignment settings page, "Common module settings" section, and set the "Group mode" field to "Visible groups", and set the "Grouping" field to the name of the grouping you created.
3. After this configuration, go to the Quiz results page, and you will see that there is a new filter added "Visible groups" with the name of the grouping you have selected. You can then select the particular group of students whose results you want to see.

2. Quiz settings - Common module settings





3. Quiz results page