I think it would be good to revise whatever u have studies for DGCA exams.. all numericals.. MH,MB,RBI calculations, rules for CP/PNR.. TAT/SAT Calculations, density alt., pressure alt. calculations.. etc.. practise all these, and i think u shud get through.. no need to carry CX2 or Calculators.. they ain't gonna allow that.. so, m guessing its gonna be pretty basic