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A
Memorizing definitions
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B
Practicing spatial visualization — mentally rotating, flipping, and fitting shapes together — since the section tests this skill
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C
Reading more vocabulary
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D
Studying math formulas
Why this is the answer
The best way to improve is PRACTICING SPATIAL VISUALIZATION — mentally rotating, flipping, and fitting shapes together — since Assembling Objects specifically tests this spatial-reasoning skill. ASVAB Assembling Objects isn't about facts or formulas; it measures how well you can manipulate shapes in your mind. Practice with sample problems, puzzles, and mental rotation exercises improves speed and accuracy. Unlike Word Knowledge (vocabulary) or Arithmetic (math), this section rewards visual-spatial ability, which improves with targeted practice. Working many practice problems builds the mental 'muscle' for these tasks.
Source: ASVAB Assembling Objects — Improving Spatial Skills