What are important topics in Computer System Architecture for GATE CS?

Data Structures
One of the most important constant topics for GATE 2018 are – Recursion, Trees and Graphs.
Maximum weightage is given to the topic of trees.
Questions from all the levels can come from the topics Recursive functions and pointers.
Easy Questions can be expected from the topics- Stacks, Queues and Linked Lists.
Algorithms
One of the most important constant topics for GATE 2018 are – Algorithm Analysis, Sorting Algorithms, Graph Algorithms and Heap Trees.
Maximum weightage is given to the topic of Sorting Algorithms and Dynamic Programming.
Questions from all the levels can come from the topics Divide and Conquer Algorithms & Greedy algorithms.
Easy Questions can be expected from the topics- Divide and Conquer Algorithms.
Operating Systems
One of the most important constant topics for GATE 2018 are – CPU Scheduling Algos, Semaphores, Paging and Page replacement algorithms.
Maximum weightage is given to the topic of Paging and Page replacement algorithms.
Questions from all the levels can come from the topics Semaphores and Segmentation.
Easy Questions can be expected from the topics- Disk Scheduling Algorithms and Deadlock.
Engineering Mathematics
One of the most important constant topics for GATE 2018 are – Matrix Determinant, Propositional Logic and Predicate Logic.
Maximum weightage is given to the topic of Mathematical Logic and Linear Algebra.
Questions from all the levels can come from the topics Probability and Predicate Logic.
Easy Questions can be expected from the topics- Groups, Functions and Lattice Theory.
Digital Logic
One of the most important constant topics for GATE 2018 are – Combinational Circuits and Minimization and Couters.
Maximum weightage is given to the topic of Combinational Circuits.
Questions from all the levels can come from the topics Sequential Circuits.
Easy Questions can be expected from the topics- Number system, fixed and floating point registers.
Computer Architecture and Organization
One of the most important constant topics for GATE 2018 are – Pipelining and Cache Organization.
Maximum weightage is given to the topic of Cache Organisation.
Questions from all the levels can come from the topics Pipelining and I/O Data transfer.
Easy Questions can be expected from the topics- Machine Cycles and Addressing modes.