Nothing is impossible in this world. If you are thinking to prepare by self-study, Yes you can do but you need to start preparation with a strategy very earlier at least one year.
But it will also be more beneficial if you join the coaching institute as it provide you
-A fixed time interval.
-You can attend one class two times for better understanding.
-If you have any doubts you can clearly ask as many times as you want.
-You will get practical knowledge in coaching centers.
There are some coaching institutes that offer quality education namely
Vajiram & Ravi – Old Rajinder Nagar, New Delhi – 110009.
ALS IAS – Mukherjee nagar near batra cinema, New Delhi – 110009.
SRIRAM IAS – GTB nagar and Old Rajinder Nagar.
Chanakya IAS – Outram Lane / Mukherjee nagar, New Delhi – 110009.
Drishti IAS – Mukherjee nagar.