I got 76% with my self written NB.Can you tell me what is the achievable value?
Maximum Percentage that can be achieved with MultinomialNB?
Hey @fguglani,
Accuracy always depends on few things.
- Data Preprocessing
 - Features Selected
 - Model Building
etc etc 
If you use naive bayes 85-86 is the max accuracy you will be able to achieve as far as i know  (there is always scope for improvement)
I used NeuralNets and got 90% accuracy, and with proper hyper parameter tuning in neuralnets, hopefully you will be able to achieve around 92.
So, you can try some hyperparamer tuning or a different model
Hope this helps !
Please mark the doubt as resolved in your doubts section ! 
Happy Learning 