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    What is the derivative of sin⁡(x)\sin(x)sin(x)?

    A
    −cos⁡(x)-\cos(x)−cos(x)
    B
    cos⁡(x)\cos(x)cos(x)
    C
    tan⁡(x)\tan(x)tan(x)
    D
    sin⁡(x)\sin(x)sin(x)
    Trigonometric Derivatives78%82%

    Solve for xxx: x2−5x+6=0x^2 - 5x + 6 = 0x2−5x+6=0

    A
    x=1, 5x = 1,\ 5x=1, 5
    B
    x=2, 3x = 2,\ 3x=2, 3
    C
    x=4, 6x = 4,\ 6x=4, 6
    D
    x=−2, −3x = -2,\ -3x=−2, −3
    Quadratic Functions64%57%

    The author uses contrast primarily to...

    A
    Entertain readers
    B
    Highlight a tension
    C
    Build suspense
    D
    Define a term
    Reading Comprehension55%61%

    If μ=50\mu=50μ=50 and σ=10\sigma=10σ=10, what is zzz for x=70x=70x=70?

    A
    z=1.0z=1.0z=1.0
    B
    z=1.5z=1.5z=1.5
    C
    z=2.0z=2.0z=2.0
    D
    z=2.5z=2.5z=2.5
    Data Analysis71%66%

    Which organelle runs photosynthesis in plants?

    A
    Chloroplast
    B
    Mitochondria
    C
    Golgi
    D
    Vacuole
    Cell Structure and Function52%58%

    The paragraph 2 example mainly helps the author...

    A
    Counter an objection
    B
    Show the claim in action
    C
    State the core conflict
    D
    Shift to a new idea
    Evidence and Purpose48%54%

    What is the derivative of sin⁡(x)\sin(x)sin(x)?

    A
    −cos⁡(x)-\cos(x)−cos(x)
    B
    cos⁡(x)\cos(x)cos(x)
    C
    tan⁡(x)\tan(x)tan(x)
    D
    sin⁡(x)\sin(x)sin(x)
    Trigonometric Derivatives78%82%

    Solve for xxx: x2−5x+6=0x^2 - 5x + 6 = 0x2−5x+6=0

    A
    x=1, 5x = 1,\ 5x=1, 5
    B
    x=2, 3x = 2,\ 3x=2, 3
    C
    x=4, 6x = 4,\ 6x=4, 6
    D
    x=−2, −3x = -2,\ -3x=−2, −3
    Quadratic Functions64%57%

    The author uses contrast primarily to...

    A
    Entertain readers
    B
    Highlight a tension
    C
    Build suspense
    D
    Define a term
    Reading Comprehension55%61%

    Tracks Every Skill

    Each question shows the skills it tests. Every answer updates those skills, not only whether you passed that item.

    Spaced Repetition

    Weak skills come back before you forget them. Review timing is personal, learned from your answers, not set to a generic schedule.

    Targets Your Weakest Spot

    The next question isn't random. Skillium picks what you need most right now based on weaker skills and what's ready for review.

    How It Actually Works

    1
    Build Your Session
    Pick your topics or upload your own notes. Skillium anchors your quiz to the skills behind what you picked.
    2
    Practice Questions
    Answer adaptive questions. We analyze the specific skills involved, not just if you got it right or wrong. Every question comes with a full explanation so you understand why, not just what.
    3
    Target Conceptual Gaps
    We target the specific concepts that would help you improve the fastest. No more guessing what to practice. View your progress in real-time.
    4
    Master the Skills
    Review concepts right before they fade. We automatically measure forgetting and surface the skills you need to review.

    Frequently Asked Questions

    Why Skillium?

    Most test prep tools dump hundreds of practice problems at you and hope something sticks. They track what you got wrong, but not why, so you grind the same mistakes over and over without your score moving.

    Skillium was built to fix that. Whether you're prepping for the SAT, ACT, or any other exam, it maps the skills behind every question, targets your real weak spots, and brings concepts back before you forget them.

    Get Started Free

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