getting 88/100 and cannot make it 100 though all test passes
I assume you have checked and that all your tests in the notebook pass when you run them locally. If that is true, then the most likely problem is that one of your solutions is written in a way that is not “general”: it works with the one test you can see, but the grader uses different tests. Examples of how this can happen would be referencing global variables within the body of your functions, rather than using the actual parameters of the function or hard-coding some values to match the dimensions of the inputs or the like.
Sorry that the grader sometimes gives feedback like this that really doesn’t give you much of a clue of where to look. If my hints above don’t shed any light, then there are other ways we can try to help. Please check your DMs for a message from me about how to proceed in that case.
Have you renamed your notebook ipynb file? That would cause all sorts of problems.