Taking a standardized test, like learning to swim, is a daunting task mitigated by wearing arm floaties. Buoy your brainpower with today's Groupon to Knewton. Choose between the following options:

• For $49, you get an online SAT-prep course (a $150 value).
• For $149, you get an online GMAT Instant–prep course (a $399 value).

Knewton's designs syllabi to fit individuals' educational needs with a medley of customized practice drills and dynamic online lessons. The 10-session SAT course eschews dog-eared textbooks in favor of personalized study plans and progress reports that strengthen educational Achilles' heels in writing, reading, math, and theoretical-train tracking. The site's complex educational algorithm reacts to students' progress and updates content on a daily basis. Prerecorded video lessons, led by Ivy League instructors, help reinforce plans of algebraic attack and word warfare as soon-to-be-anointed SAT slayers quest for Knewton's promised 150-point increase.

The company's GMAT Instant lessons forge academic diamonds through customized materials, video teaching sessions, and more than 3,400 practice questions. The personalization system analyzes more than 1,000 testing concepts in order to concoct lesson plans that serve as potent brain marinades. Six full-length practice tests act as benchmarks during an academic regimen more rewarding than sleigh-jacking Santa Claus. Knewton's GMAT courses feature 13 online sessions and assure a 50-point score improvement.

Knewton's money-back guarantee ensures that Groupon customers who do not see their scores improve by 150 points on the SAT or 50 points on the GMAT can be refunded the amount they paid for the Groupon by Knewton.