Marks & Spencer is on the cusp of turning around its struggling General Merchandise (GM) division, according to Panmure Gordon which has maintained its 'buy' rating and 516p target price for the stock after a first-quarter trading update on Tuesday.The broker said: "We are positive on MKS for four reasons: 1) strength in the Food division; 2) potential for turnaround in the GM division; 3) a growing, capital-light International business; and 4) a recent commitment to delivering improved returns to shareholders."Investec has upgraded its rating for publishing and education group Pearson from 'hold' to 'add', raising its target price for the stock from 1,150p to 1,250p."We could be somewhat early still and 1H figures in July are unlikely to sparkle, but we move more positive," said analyst Steve Liechti in a research report on Tuesday. He said that the company is well-placed "if/as things pick up with towards 60% of sales in digital/services excluding Penguin".Share prices of platinum mining peers Lonmin and Aquarius Platinum have received a boost after Westhouse Securities removed its 'sell' ratings on both stocks.Both stocks have been upgraded from 'sell' to 'neutral' and their target prices have edged higher, to 265p (from 250p) for Lonmin and to 40p (from 35p) for Aquarius. Nevertheless, analysts have cut their forecasts for precious metals prices following recent price weakness, which will impact earnings going forward.