This week, 3 Diversified Consumer Services stocks are improving their overall rating on Portfolio Grader. Each of these rates an “A” (“strong buy”) or “B” overall (“buy”).

The rating of Collectors Universe, Inc. (CLCT) moves up this week, rising from a C to a B. 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.

Career Education Corporation (CECO) gets a higher grade this week, advancing from a B last week to a A. Career Education Corporation provides on-ground private, for-profit, postsecondary education in the United States, in addition to having a presence in online education. The company also gets A’s in earnings revisions, earnings momentum, return on equity, and free cash flow. For more information, get Portfolio Grader’s complete analysis of CECO stock.

This week, ATA, Inc. Sponsored ADR (ATAI) pushes up from a C to a B rating. ATA, Inc. Sponsored ADR offers services for the creation and delivery of computer-based tests based on its proprietary testing technologies and test delivery platform. The company also gets A’s in earnings momentum and free cash flow. For more information, get Portfolio Grader’s complete analysis of ATAI 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.