what government Pharmacy colleges can I get through bcece UR rank 6138 and EWS rank 835 (PCB)
Your UR rank of 6138 and EWS rank of 835 are below the usual closing ranks for government BPharm seats in Bihar, which are generally around UR 3000 and BC 4377. This makes admission to top government pharmacy colleges like Government Pharmacy Institute Patna or MIT Muzaffarpur unlikely under the UR or EWS categories.
You should consider private or government-aided pharmacy colleges in Bihar, where ranks up to 10000 are typically accepted.
Make sure to participate in BCECE counselling, selecting EWS category options and private colleges to improve your chances of admission.