The FIITJEE Pinnacle program is essentially FIITJEE coming to your school and renting a few classrooms to give you IIT coaching during school hours. The school teachers will come and teach you other subjects such as English and your optional, but the main focus will on JEE Mains and Advanced studies. The only advantage you'll get with this program is that you won't have to roam around after your school finishes. You can relax after school and use the extra time for self study. The only stumbling block is the fees, which is almost double of the classroom program. Choose wisely.