Well, let's see: You've got your blood draw, urinalysis, EEG, ECG, cardiac stress test, abdominal, cardiac and carotid ultrasounds, chest x-rays... and that's pretty much it for Day One.
Next up are the full eye and ear tests, colorblindness, blood pressure reading, followed by a full-body exam done in the nude - checking for scars, freedom of movement, hernias, etc. Folks over 40 will be also be subject to a CAT scan. Anomalies on any of the above tests result in either more invasive exams (biopsy, radioactive dye), or simply failure of the medical.
The ATP written is based (LOOSELY) on the FAA written, administered in largely the same manner. Translation errors and flat-out erroneous information abound. 70% is a pass, any more than that and you're just showing off. Unlike the other steps here, retakes of failed written exams are common.
The checkride is a bit of a wild card, largely dependent on the examiner you draw. Some candidates get little more than a LOFT, others end up on the standby instruments with a busted engine. Regardless of your performance, the examiner will take the opportunity in the debrief to run your skills and last company's procedures into the dirt. Any attempt to cut across him will not go over well.
If you can manage all that, then congratulations, you're among the most sought-after pilots in the world. Please negotiate with your employer accordingly. In my experience, once you get past the surly, incompetent, or just plain mean gatekeepers at the CAAC, things start looking up.