How should I prepare for IIT-JAM geology?

In the following, some important tips are listed that will be quite beneficial for taking preparation for IIT-JAM Geology.

• The first and foremost thing is to collect and go through the previous year’s questions. Most students avoid the subjective type questions, but it is important to make sure that the B.Sc level concept of the student is obvious.
• Analyze the topic, which is frequently asked. Presently, a 30% prediction from the nat section can be made. You will observe repetition in every section but the way of asking can be different. 
• Go through the previous year’s GATE questions, but focus on the syllabus of B.Sc level.
• However, there are also some questions from M.Sc level, but these are rare. So, do not waste time practicing these questions, as these contribute only 5-7%. For these types of questions, you can practice previous year’s M.Sc level questions and can search for similar questions from CSIR NET, GATE, etc.
• For the last 3-4 years, the nat section questions are coming from the higher secondary syllabus. You should cover the topics like physical chemistry, inorganic chemistry, and mechanics, as all these have a usage in Geology.
• Besides, prepare topics including, waves, gravitational, coordination no., magnetism, thermodynamics, the periodic table, force and motion, ray optics, thermal, solid and fluid bodies properties, redox reaction, light radioactivity, Mole concept, electromagnetic radiation, equilibrium, general isolation, solid-state, chemical bonding, and atomic structure.
• Read a single topic at a time, specifically from the books covering most of the parts. It will give a better understanding of the concept of structural geology. 
• Download and buy questions like Shakeel Ahmad, Azhar Hussain, and Ausuf Sayeed. It will assist in getting the topic-related idea and the type of questions.
• Make notes from the chapter that you find difficult.

Practise is essential. You will find a better understanding of the topic and the entire syllabus. It will be better if you practice from the diverse question sets, as it will clear your perspectives.