Thanvi_Enbaraj
Hii, sometime before I was going through the same situation so according to me, look it depends on your educational base if you are good in reasoning, quant and in English then you can prepare by your self but if are not good at these subjects then you should take coaching or you can prepare from the youtube channel as well .

But let me clear you one thing without self-preparation nothing gonna work.
So, analyze your strong and weak points and then decide.

      Hi,
      you should go with the mock test first to analyse your strong and weak areas. As the syllabus of this exam is focused on Reasoning Ability, Quantity aptitude and English language and Mains part of this exam demands Banking awareness and current affairs in addition. If you find that you are good enough and you can score well to clear cut off only by self practice, you should not join coaching. And if you find your scores too much away from usual cut off then you should take coaching and strengthen all your weak areas. I strongly believe that speed is going to be a factor to qualify SBI PO exam.
      Very all the best !!