Quick answers about the Oregon knowledge test.

The Class C knowledge test has 35 multiple-choice questions. You need 28 correct to pass, which is 80 percent. Questions cover signs, signals, traffic laws, and shared-road rules drawn from the Oregon Driver Manual.

You need 80 percent to pass: 28 correct answers out of 35. There is no per-section minimum, so a strong score in one area can offset a weaker one as long as your total clears 28.

An original Class C license is $64, valid for eight years. Add $30 for the instruction permit, $7 each time you sit the knowledge test, and $45 for the drive test. Plan on roughly $146 in DMV fees if you pass both tests on the first try.

Yes. Oregon offers the Class C knowledge test online through DMV2U, available at any time; the alternative is testing at a DMV office by appointment or standby. You need a desktop or laptop with a keyboard, mouse, and webcam (phones and tablets are not allowed), and the webcam takes random photos during the test to confirm your identity. If you are under 18, a proctor age 21 or older must supervise. You may take the test online up to four times, at most twice in any 24-hour period; after four attempts you must test at a DMV office.

An Oregon instruction permit is issued for 18 months and may be renewed once. Drivers under 18 must hold the permit for at least 6 months before applying for a license; an out-of-state permit counts toward that 6 months. Adults 18 and older have no minimum holding period.

Bring three things: proof of identity and date of birth (a U.S. birth certificate or passport works), proof of current Oregon residence address (such as a utility bill or other business mail with your name on it), and your Social Security number, which you certify electronically during the application. Documents must be original or certified copies, not photocopies. REAL ID issuance has additional document requirements; see Oregon.gov/REALID.

Yes. At a DMV office you may test again the same day, depending on testing availability. Online through DMV2U, you may attempt twice in any 24-hour window, up to four total attempts before you have to test in person. Each attempt costs the $7 knowledge-test fee.

Zero. Oregon is a zero-tolerance state for drivers under 21, so any measurable blood alcohol concentration is a violation and triggers a license suspension. The 0.08 percent threshold that applies to drivers 21 and older does not apply to anyone younger.

Dim your high beams within 500 feet of an oncoming vehicle and within 350 feet when you are following another vehicle. The two distances are different, and the test checks whether you know which one applies.

Holding a phone or any mobile electronic device while driving is illegal for everyone, including at red lights. Drivers 18 and older may use a hands-free accessory; drivers under 18 may not use a cell phone at all, even hands-free. A first offense is a Class B traffic violation with a fine up to $1,000; a second offense in 10 years, or a first offense that contributes to a crash, climbs to $2,000.

The school speed limit is 20 mph. It applies whenever the yellow lights on the school speed sign are flashing, during the posted school hours, or when children are present near the roadway, depending on which sign is posted. The zone starts at the SCHOOL SPEED LIMIT 20 sign and ends at an END SCHOOL ZONE sign or the next posted speed sign.