The 'Mean Girls' actress, who is on probation for a driving under the influence conviction (DUI), was ordered by Judge Marsha Revel that her classes must now take precedence over everything else.
Speaking at the Superior Court in Beverley Hills on Tuesday (15.12.09), the judge said: "I am going to order that this has to be done. It's been long enough.
"This has to be a top priority whether she has a job somewhere else or doesn't or something else comes up. This has to be done once a week.
"Right now, the other things will take second place and this will take first place."
Lindsay has a deadline of July 15, 2010, to complete the six months of programme time.
In October, Lindsay was ordered to a Beverly Hills court amid rumours she was not complying with the court-ordered alcohol education lessons.
Gossip website TMZ claimed sources running the course contacted the court about Lindsay's conduct and that she has been "outright violating the terms of the programme".
Lindsay famously served just 84 minutes behind bars in 2007 before being placed on probation after pleading guilty to two counts of being under the influence of cocaine, and no contest to two counts of drunken driving and one count of reckless driving.
The actress and clothes designer has been in India recently filming a TV series about human trafficking.