Hello,

Sample paper is available online. you can get it from there. Percentage is unknown as the institute decides it. try to score above 80% of the total marks. keep practicing as much as you can. The most important is you have to make less mistake as much as possible.

There are other streams offered by JMI. you can prepare for them also available you are eligible for it. as you are asking about MA, then you are done with graduation. so masters is done in the same domain in which UG course is done. You can't change it.

So  don't think that you won't qualify. prepare well and practice as much as you can. Draw diagrams and flow chart to remember difficult concepts.

Hope it helps!