I'm trying to get 180 marks in jee 2018 so what should I do
If you want to score good marks in JEE make sure your basics are clear. You you read NCERT books throughly. So, that you can solve tricky questions easily.
You should focus on important topics more which carries more weightage in the exam.
You can solve as many as MCQs for your practice.
For exam pattern and to know level of questions you can refer previous year papers.
Solve complete mock test series to work on your time management and to increase your speed with efficiency.
With the help of mock test series you can analyze your preparation level and you will get to know your strength and weakness. So, you can work upon them.
Revision plays very important role in scoring good marks. You should revise your syllabus properly. You can make your important notes as well which will help you in revision.
All the best for your preparation!!