A student studies for long hours but without proper planning. This may result in
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Effective study habits include:
• Proper planning.
• Short study sessions with breaks.
• Regular revision.
• Adequate sleep and relaxation.
These improve learning and reduce mental fatigue.
Concept:
Effective learning depends on proper planning, regular breaks and good study strategies. Studying continuously for long hours without planning often causes fatigue and reduces learning efficiency.
Step 1: Understand the situation.
Lack of planning leads to poor concentration, stress and reduced productivity.
Step 2: Analyse the options.
• Better retention -- Not guaranteed.
• Faster learning -- Unlikely.
• Decreased efficiency and mental fatigue -- Correct. \checkmark
• Perfect understanding of all topics -- Unrealistic.
Step 3: Final conclusion.
Therefore, studying for long hours without proper planning may result in
\[
\boxed{\text{Decreased efficiency and mental fatigue}.}
\]