Hi Joyce
It looks like the GIFT format for quiz questions is the easiest to use as it can be used with a text editor but still requires some syntax knowledge.
There are some Excel to GIFT converters such as https://convert.cerapoda.io/ - I haven't used this but looks like there is a cost if doing more than 10 questions, There are also Word to GIFT converters such as https://digitaliser.getmarked.ai/convert-word-into-gift/
Regards