Questions about Tandon and internal transfers

I’ve just been admitted to the Tandon School of Engineering with an 18,850 scholarship for Computer Science, but I really wish I applied to Gallatin instead, because I now know I want to also explore pre-law and political science along with CS. How difficult is the transfer to Gallatin? And more importantly, will I be given scholarship or aid at Gallatin if I transfer? Another question I had was about Brooklyn and Manhattan, considering that Tandon is in Brooklyn, is Brooklyn really that meh compared to Manhattan?