Hello there,

See, if you are unable to pass any subject than you have to repeat the same class.

Each and every subject is compulsory to pass, or if you are weak in any subject then try to get at least passing marks in that subject so that your one year will be save .      you don't need to repeat the same class.

If you are weak in mathematics then try to get passing marks , for that you should focus on the easy chapters then step by step move towards on the hard one. Starts practicing question from the chapters that is easier for you .

You can also go through the wait age of the chapter  , you select the chapters have more wait age and also analyze the pattern of the question , there after give priority to those chapters where have the most of probability to ask the question.

You don't need to Practice all the chapters , Never the less you can go with the selected chapters from where most of the questions have asked.

And Lastly you just need to solve Previous year question paper that will help you to analyze your mistakes and boost your preparation.

I hope his Information will help you at some extant.

Good Luck!