Hey Pathan,
As an engineer, most of us used to study for a month or a week or a day before the exam. So if you are very interested to crack SSC JE exam the best way is to study every day. Devote 2 hrs every day for it and increment the time as the day passes. And this will help you to concentrate and also this will also help you to complete both syllabus.
Hope that helps
all the best
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