The Exam is not tough or Easy whether it is UP board Arts or Science, It depends on your study preparation & devote your time with hard work . Here are some preparation tips you can follow for your 12th boards preparation:

After completing any topic you should revise it two or three times. So, that you understood that topic completely.  

You should make your proper time-table. So, you get time for proper revision. You can make your own notes it will help you in revision. Solve previous year papers to understand the difficulty level of the exam.

Good Luck!