Syllabus: 

1. Number System [ Divisibility, Concept and applications of H.C.F and L.C.M. , Theory of Congruence (optional), etc.][MUST DO]
2. Permutation and Combination [It is one of the most important chapters that you must prepare without fail.][MUST DO]
3. Probability
4. Theory of Equations [mainly Quadratic Equations][MUST DO]
5. Sequences and Series [A.P., G.P.,H.P., Inequalities related to AM and GM]
6. Geometry [Congruency of triangles, Similarity of triangles, Quadrilaterals(especially focus on the properties of parallelograms and rhombus), Some theorems related to triangles (ex: Pythagoras theorem, Thales’ theorem, Angle Bisector theorem, Ceva’s theorem,etc.),etc.][MUST DO]
7. Mensuration [Class 9 and 10 level]
8. Coordinate Geometry[Focus on the basics, the straight lines, circle (you may leave the conic section)]
9. Functions [Concept of domain and range, Different types of functions, Different types of mappings, Even and Odd functions, Periodic functions, Composite functions, Graphs and its transformation, some basics of functional equations][MUST DO]
10. Trigonometry [Basic concepts, Identities, Heights and Distances, Compound Angles, Multiple Angles, Solution of Triangles]
11. Complex Numbers [Concept of iota, Algebraic operations, square root of a complex number, De Moivre’s theorem, Cube roots of unity. You can leave the geometrical representation and geometrical application of complex numbers]
12. Binomial Theorem [only basic concepts]
13. Basic concepts of Matrices and Determinants
14. Arithmetic [ mainly focus on Time,Speed and Distance, Ratio and Proportion, Percentages, Averages and Mixtures. ]
15. Logical Reasoning [Data Interpretation, etc.]

All the best!

I would suggest you to go through with the given below link to check IPMAT syllabus.

https://bschool.careers360.com/articles/ipmat-syllabus

Good Luck!