The grades of 3 Diversified Consumer Services stocks are better this week, according to the Portfolio Grader database. Every one of these stocks has an “A” (“strong buy”) or “B” overall (“buy”) rating.

Capella Education Company (CPLA) earns a B this week, jumping up from last week’s grade of C. Capella Education Company is an online postsecondary education services company that offers doctoral, master’s, and bachelor’s programs. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of CPLA stock.

Collectors Universe, Inc. (CLCT) improves from a C to a B rating this week. Collectors Universe, Inc. provides third-party authentication, grading, and related services for rare and collectible items. The company also gets A’s in return on equity. For more information, get Portfolio Grader’s complete analysis of CLCT stock.

K12 Inc. (LRN) shows solid improvement this week. The company’s rating rises from a C to a B. K12 Inc. offers proprietary curriculum, software and educational services created for online delivery to students in kindergarten through 12th grade. The company also gets A’s in earnings revisions, earnings momentum, and free cash flow. For more information, get Portfolio Grader’s complete analysis of LRN stock.

Louis Navellier’s proprietary Portfolio Grader stock ranking system assesses roughly 5,000 companies every week based on a number of fundamental and quantitative measures. Stocks are given a letter grade based on their results — with A being “strong buy,” and F being “strong sell.” Explore the tool here.