Good grief!
You seriously need to do further reading on General Relativity, by actually picking up and reading the physics textbook or go back to school and take up physics, because you are seriously haven’t understood even the basics.
General Relativity is a lot larger than the 1st year uni or college level, and clearly you have ignored a lot of it.
Some parts of GR have been tested, and some parts have application in science and technology, BUT there are parts that remained untested and remained theoretical.
For instances, GR include the singularity (which you have mentioned): the singularity of stellar blackholes have been tested, in most case, indirectly detected, while the singularity of the earliest stage of the universe is still untested and undetected.
Another example is the wormhole, which is part of GR that remained theoretical.
There are some more areas of General Relativity, which remained “theoretical”, and untestable. You giving a percentage of accuracy of 99.8% is absurd and arbitrary - or to put it more bluntly, stupid.
You cannot put percentages of accuracy on GR, based on your personal preferences, when you ignore other parts of GR.