There are several specific topics or subtopics within the subject of Electronics and Communication Engineering (ECE) that have higher section-wise weightage. These topics are crucial for students to focus on while preparing for exams. Let's explore some of these key areas in detail:

1. Electronic Devices and Circuits:
- Transistors: Transistors are extensively used in electronic circuits. Students should have a clear understanding of the working principles, types, and applications of transistors.
- Amplifiers: Amplifiers play a crucial role in signal processing. Topics such as small-signal analysis, frequency response, and different amplifier configurations are important to cover.
- Diodes: Diodes are essential components in rectification and switching circuits. Understanding diode characteristics, rectifiers, and voltage regulators is essential.

2. Digital Electronics:
- Logic Gates: Logic gates form the building blocks of digital circuits. Topics such as Boolean algebra, truth tables, and logic gate implementation are frequently asked in exams.
- Flip-Flops: Flip-flops are sequential logic circuits used in memory and data storage applications. Topics such as SR, D, JK, and T flip-flops, along with their characteristic tables and excitation equations, should be thoroughly studied.
- Counters and Shift Registers: Counters and shift registers are widely used in digital systems. Knowledge of different types of counters (up, down, and asynchronous) and shift registers (serial-in-serial-out, serial-in-parallel-out, etc.) is necessary.

3. Communication Systems:
- Analog Modulation Techniques: Topics such as amplitude modulation (AM), frequency modulation (FM), and phase modulation (PM) are important. Students should understand the modulation process, modulation index, modulation bandwidth, and demodulation techniques.
- Digital Modulation Techniques: Key topics include amplitude shift keying (ASK), frequency shift keying (FSK), and phase shift keying (PSK). Understanding the bit error rate (BER), power spectral density, and demodulation techniques is crucial.
- Noise and Channel Capacity: Students should be familiar with different types of noise and their effects on communication systems. Topics such as signal-to-noise ratio (SNR), Shannon's channel capacity, and error probability calculations are frequently covered.

4. Electromagnetic Theory:
- Maxwell's Equations: Understanding Maxwell's equations and their applications in electromagnetic wave propagation is vital. Topics such as electromagnetic wave equations, wave polarization, and reflection and transmission of waves at boundaries should be covered.
- Transmission Lines: Transmission lines are used for efficient transmission of signals over long distances. Topics such as characteristic impedance, propagation constants, and impedance matching are important.
- Antennas: Antennas are essential for transmitting and receiving electromagnetic waves. Students should have knowledge of antenna parameters, radiation patterns, and antenna types (dipole, loop, helical, etc.).

By focusing on these specific topics or subtopics within the subject of Electronics and Communication Engineering, students can allocate their study time more effectively and increase their chances of scoring well in exams. Remember to refer to textbooks, lecture notes, and practice previous years' question papers for comprehensive preparation.