Dear Aspirant,

• 80–90% Questions in Physics And Chemistry section are Previous Year Questions of NEET/AIPMT/AIEEE/IIT-JEE or other Pre-Medical Exams.
• Except for TEST 1, the questions in Biology are NCERT based (80–90%).
• (10–20%) Questions in biology have been out of NCERT textbook and some even beyond Coaching Modules.
• The majority of the questions asked in Biology are also Previous Year Questions from NEET/AIPMT and other Pre-Medical examinations.

So I can conclude one thing from these observations i.e you may find 10–20% questions similar because every year there are a few questions which tend to repeat.

In 2019, most of the difficult or Moderate Questions in Physics and Chemistry were previous year Questions from AIEEE/IIT-JEE(2002–2015). They were directly copy-pasted and some with changed values orbit of the twist as well.

So there are chances that the difficult questions might appear in NEET 2020 but still, I would say that you shouldn't expect anything from the NTA mock tests except conceptual Practice

Best of luck for your bright future