Hi

Thanx for your question.

Firstly you need to identify your most preferred and least preferred courses.Look for cut-off of most preferred course in JU.Do not spend more than 15 minutes in doing this. That's the upper and lower limit of your targeted achievement.Invest your remaining hours in deep practising (practise with instant feedback and mentor guidance) WBJEE sample tests , keeping in mind speed and accuracy.

Hope this was helpful.

Good-Luck!!!!