Correction: To keep its hold ON the lead, Apple still needS to keep its price advantage over other competitors. To keep its lead, ALONG WITH HAVING the HIGHEST percentage of the market share, Apple still needS to keep releasing new tablets. To keep its hold on the market, Apple needS to keep its tablet PRICES LOWER THAN THAT of other competitors.

The most important thing is putting an 's' on the end of "need". A good rule to follow is this: You, I, or they? It stays the same. He, she, or it? Add an 's'. That is, you need, I need, they need, but he needs, she needs, it needs. Anyway, other than that, it's mostly alright. There are a few little things that make the sentences sound awkward to me, but that's mostly due to them talking about a very technical subject. Any correction I'd make (other than the whole need/needs thing) is so small that you wouldn't even learn anything from it; you'll simply get ever-so-slightly better the more you speak and write.

Thanks Nanren, Yeah, highest percentage would be better, when it comes to the implications about Apple, they don't represent my personal view.:)

All good. One point: Apple, as a single entity should get a 3rd person singular verb "needs". . The rest are small points. To say "other competitors" is natural but redundant as Apple is not a competitor for itself. "competitors" would be enough. . Perhaps I would use "it's hold on the lead". . I would say "highest percentage" & perhaps "highest percentage market share". . So the sentences read well, though I think I disagree with the implications about Apple in each :)