Produce a table from by looking up cells in another table

I have student grades and I would like to see every student that scored below a 70 on each assignment given. Is there a way to produce such a table. I have been experimenting with IF and INDEX and ARRAY, but have not been able to figure it out. Here is a picture of what I am trying to make (though any solution that work would be fine - it does not have to produce the exact same table)
Capture.PNG
Thank you!

I am attaching the file.