This is a great buy if you want to get a 100%.

The Grand Theft Auto V Official Interactive Strategy Guide is now available for iPad.
An interactive version of the entire Grand Theft Auto V Signature Series Guide from BradyGames, featuring high-resolution interactive versions of the map with selectable lists for tracking collectibles alongside:

Main Story & Missions
Walkthroughs for every mission, including the planning and execution of all of the major heists. Know exactly when to jump in and out of the lives of each of the three main characters and which weapons, tactics, and routes are most effective. Dive deeper into the story with tips for each mission and insight on every twist and turn; know when choices with consequences must be made, and achieve a Gold Medal every time.

Hobbies & Pastimes
Tips for every job and ambient activity including Hunting, Races, Arms Trafficking, Flight School, Property Management, Skydiving, Golf, Assassination Missions, Yoga, and more—we’ve got you covered.

Maps & Collectables

Maps and detailed descriptions for all Aerial Challenges, Stunt Jumps, Spaceship Parts, Submarine Pieces, Hidden Packages, and more.

100% Completion
Detailed instructions on how to find every colorful character to meet, all activities to complete and everything else you need to achieve 100% completion.

The Grand Theft Auto V Official Interactive Strategy Guide requires iOS 4.3 or later and is available now on the iTunes Store for $4.99.