(a) Two points shall be deducted from a licensee's assessed total if the licensee has not been convicted of a violation of traffic laws that occurred during the 12-month period after the date of the last violation of which the licensee was convicted.
(b) In addition to (a) of this section, two points shall be deducted from the assessed total upon the driver's furnishing to the department adequate proof of successful completion, within 12 months of the date of the driver's last violation, of a driver improvement course approved by the department or an alcohol information course approved by the Department of Health and Social Services, except that
(1) not more than one driver improvement or one alcohol information course may be used to obtain a reduction in points in any 12-month period; and
(2) a driver improvement course for a person under 21 years of age must be a course that is designed to benefit persons under 21 years of age and must be certified by a national organization.
(c) One point shall accumulate to the driver's benefit for each 12 consecutive months of licensed, violation-free driving within the five-year period preceding the point calculation.