Frankly speaking, the syllabus of this exam isn’t that complicated to understand.Trainers from Avision Institute also state that the NIACL Assistant Syllabus is one of the easiest ones because of simple subjects. 

Subjects are also less in number, which means you don’t need extensive studying. 

You need to study: 

For Prelims:

• English Language 
• Reasoning 
• Numerical Ability 

For Mains 

• Reasoning 
• English Language 
• Computer Knowledge 
• Numerical Ability 
• General Awareness