Starting early does have its advantages especially for Civil Services e.g Tina Dabi (AIR -1), she planned her preparation meticulously and she was thorough in her approach, her mains marks are testimony to this fact. You can self pace your preparation in a continuous manner and can also work on your weaknesses. Many institutes today are offering this course where students can start as “Early bird”. However, it is important to work on it a following manner i.e.
I have created a plan for my undergraduates students in this manner:
Block 1: 6 months
Block 2: 6 months
Block 3: 6 months
Block 4: 6 months
Block 5: 6 months
Block 6: 6 months
You can also plan your preparation with weekly & monthly targets. Now remember execution is the key here.