I teach an introductory 6th grade computer science class where we spend part of the quarter learning a few of the Google Suite products. One of those is Google Slides. First I have students do two assignments from the learn-by-doing series, Lessons 4.1 and 4.3, which is not something I created (see link https://www.sps186.org/downloads/basic/585811/LBD_GoogleDocs_eBook_District-(1)-109-140.pdf)
As their culminating project and assessment, I have them create their own Google Slides presentation, which they eventually present to the class. Lesson 4.3 from the link is the one I refer to directly in the assessment instructions. The attached ZIP file includes the assessment in the following formats, Word file (DOC) and Acrobat Reader (PDF). In my class, this assignment is worth 20 points. Presenting it to the class is worth an additional 10 points, which they get as long as they get up and try.