The grades of 3 Diversified Consumer Services stocks are on the rise this week on Portfolio Grader. Each of these stocks is rated an “A” (“strong buy”) or “B” overall (“buy”).

Collectors Universe, Inc. (CLCT) boosts its rating from a C to a B 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.

This week, Tarena International, Inc. Sponsored ADR Class A’s (TEDU) ratings are up from a B last week to a A. The company also gets A’s in sales growth and earnings growth. For more information, get Portfolio Grader’s complete analysis of TEDU stock.

Lincoln Educational Services Corporation’s (LINC) ratings are looking better this week, moving up to a A from last week’s B. Lincoln Educational Services Corporation offers recent high school graduates and working adults degree and diploma programs at its campuses in automotive technology, health sciences, skilled trades, business and information technology and spa and culinary. The company also gets A’s in earnings revisions and free cash flow. For more information, get Portfolio Grader’s complete analysis of LINC 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.