Can I hold for the 7th point and conquer the other battlefield for the 8th?

Yes, you can win the game by holding for your 7th point and then conquering another battlefield for your 8th point in the same turn.

According to the rules and FAQs regarding scoring:

• Holding counts as scoring: Holding a battlefield at the start of your turn is a valid way to score a point.
• Winning the game: You can score the final point through holding, card effects, or by conquering a battlefield, provided you meet the specific requirements for the final point.
• The Conquer restriction: The restriction that you must score all battlefields in a single turn only applies if your final winning point comes from a conquer action.

Sequence for your scenario:

1. Start your turn at 6 points while holding a battlefield.
2. Gain 1 point from holding (reaching 7 points).
3. Conquer the other battlefield to reach 8 points.
4. Because you have scored at least one battlefield through a method that turn (the hold) and then performed a conquer to reach the final point, you satisfy the requirements to win.

As noted in the FAQs: "You can win by scoring the final point through any method except conquering a single battlefield. If you win by conquering, you must score both battlefields in the same turn." Since you held one and conquered the other, you have scored both battlefields in that turn, successfully triggering the win.