It is actually easy to score in JEE test conducted by the NCHMCT, but the thing you will have to remember is that you should score high to get admission.
The thing to remember here is that the English language section in this test has the utmost number of questions. So, it is important that you should study English, even if your language skills are good.
You can review English grammar from the class 10 and class 12 textbooks
You are recommended to take steps to improve your vocabulary to a great extent and you can pay close attention to the spellings as you will have to face questions to identify correct and incorrect spellings.
You might also get questions, where you will have to find errors from sentences, reading comprehension questions and one-word substitutions. You can prepare for these questions with the help of advanced and even Basic English grammar books.
As far as the numerical ability and analytical aptitude section is concerned, you can strengthen your fundamentals with the help of the class X books of NCERT.
You can select question books and reference books carefully that will help you gain confidence in this section.
If you are out of touch with mathematics, you should practice approximation and calculation techniques.
For the reasoning and logical deduction section, you can practice with the help of puzzles
For the general knowledge section, you should keep yourself updated with the current affairs.
Also, remember not to restrict your general knowledge preparation for just a single year as older important events might also be asked.
As far as aptitude for service sector is concerned, it does not need any real preparation, but you should use your on-the-spot logical thinking ability to clear this section.
Also, remember to attempt all questions in the aptitude for service sector section. The reason is that even the wrong answer in this section will score you +0.25 marks.