Am I taking too long??

Hey, im going into junior year and planning to take it this winter break when i have 2 weeks off. I've applied for the manhattan gmat course and did 4 weeks staight on task, but then had an intern for 6 weeks so it was to hectic for me to make time and i slacked off, and now im back and hopefully I'll manage to do another 3 weeks in 2 weeks time before my school starts in september. And I hope to finish the last 2 weeks during the semester. I feel i prepare amazingly well but also that the fact that I'm taking so long, I might forget the material i learnt. What do you think should be my strategy to beatthegmat with a really really good score. And yes, I am aiming to apply to the hbs2+2 program.