No section minimum changes your strategy
In TOPIK a weak reading score can be carried by a strong total, because levels are read off the total alone. That is structurally the opposite of the JLPT, where one section below its minimum fails you outright. Candidates who move between the two exams often bring the wrong instinct with them and either over-insure a section that does not need it or neglect one that does.
It does not, however, make reading optional. Fifty questions worth a third of the exam is the largest single lever available to you, so it is usually the most efficient place to gain points even though it is not the place where you can be disqualified.