u cant leave BITS even if u top jee next year ! so  better think abt the options u have and then join ... if u want to give  jee another shot next year..  i dunno abt dce  if u get in bits pilani its very gud its the only privtae institue which can give head on competetion to the IITs ....u can cope wid it if u try ur best 

U CAN  IF U THINK U CAN

gud luck