Can anyone tell me about difficulty level of physics and chemistry

is the IIT JEE physics and chemistry syllabus and difficulty level the same as AIPMT and NEET?

The answer is no. Physics and Chemistry preparation and difficulty level are not similar for IIT JEE and AIPMT and NEET. In order to crack IIT JEE examination, you have to practice more. Connect with JEE toppers and NEET toppers they can exactly tell you how is the difficulty level, and what was their strategy. Talk with them that will give you an overview of each examination and its difficulty level. Although the syllabus is near about similar for these exams. JEE Mains physics and chemistry difficulty level is almost similar to AIPMT and NEET. But JEE Advanced is tougher than AIPMT and NEET. You will get many directly formula based questions in AIPMT and NEET. But to clear IIT JEE you need a strong hold on every subject and concept. Most of the question of IIT JEE is concept based. If we talk about Chemistry, in JEE mains you will get many simple theoretical questions. But for AIPMT and NEET you need to practice questions thoroughly to obtain a good score in Chemistry section.
For better understanding go through previous years question papers of each examination. You will understand the differences.