Here is the ACIO Technical Examination syllabus:

General Knowledge and General Awareness
Current affairs
General science
History of India
Economic status
Scientific Research

English
Synonyms
Antonyms
Preposition
Articles
Essay writing
Precise writing
Reading comprehension
Grammar and its usage

Reasoning
Analogies
Similarities and Differences
Spatial Visualization
Spatial Orientation
Problem Solving
Analysis
Judgment
Decision Making
Visual Memory
Discrimination
Observation
Relationship Concepts
Arithmetic Reasoning
Verbal and Figure Classification
Arithmetical Number Series
Non-Verbal Series
Coding and Decoding
Statement Conclusion
Syllogistic Reasoning

Mathematical Aptitude
Problems relating to Number Systems
Computation of Whole Numbers
Decimals and Fractions
Relationships between Numbers
Fundamental Arithmetical Operations
Percentage
Ratio and Proportion
Averages
Interest
Profit and loss
Discount
Use of tables and graphs
Time and Distance
Ratio and Time