I had one student who washed out of the program. To be honest he had no business being in flight school in the first place as he was only there to please his father who was a Delta captain.
I have seen students struggle, heck I struggles myself in a few areas. It usually isn’t the actual flying that is an issue for people, it is the book work. If you make it through the education that you have the book work will be no problem at all for you. You will find that flying is a unique mix of very concrete principles and some rather abstract one.
If you want to best improve your odds at success in the program my advice would be to get as many of your written exams as possible out of the way before you start the program. If you get serious about it let me know and I will provide links to all of the exams that you will need to take and the proper course study material to buy (when you put the deposit down for ATP the study material is sent to you). I would also recommend that you study as hard as possible, that makes life so much easier.
I have never once seen a student who really buckled down and studies hard struggle in the program. Not once.