Hello

First of all congratulations for your rank.Here you didn't mention in which exam you secured this rank.If it is gate,Gate gives All india rank.It doesn't publish rank category wise.PSUs decide there own cutoff ranks category wise depending upon no of vacancies.Based on your rank you will get seat in IITS  and nits for mtech nanoscience and technology.here are the some colleges based on your rank.

IIT BOMBAY

Psg college of technology, coimbatore

IIT Madras

Delhi technological university, delhi.

Jadavpur university, kolkata

Birla institute of technology,mesra

University of Hyderabad, Hyderabad.

Hope this information helps you.

All the best.

Instead of choosing a random topic from the syllabus, you must break your preparation into sections. Sub-topics from each section should be selected and then strategy on clearing concepts must be made. Never leave any concepts doubtful or unsolved. Once done with the syllabus and concept clarity, you should move towards solving previous years papers. Give mock tests as much as possible. Time management is one more important thing you should look upon. Remember that practise will increase your efficiency. Use the books that you have studied in your undergraduate for the preparation. Along with this you can grab a book on Social Psychology by Baron and Bhardwaj, Organizational Behaviour by Baron and Greenberg. Beside this, regularly read articles, magazines, write ups about psychology.

• Firstly, you must have to be clear about the syllabus of the exam, so that you can follow the syllabus and prepare well. You should also go through the exam pattern that will help you in preparing accordingly.
• For best preparation you must have to understand about how to manage your time so that you can focus on each and every subject equally. For this you must have to make a schedule to prepare for the exam by giving equal amount of time to each subject.
• You must have to make your own personal notes during preparation time as this will help you to clear all the important and difficult concepts of the subjects concerned.
• You must have to study from the recognized and good material i.e.,  books, question papers, online study material etc., You should must purchase the books under the guidance of experts.
• After final preparation, you must have to practice for the exam by giving series of mock test online or by picking previous year's question papers which will help you to understand about the exam pattern and manage your time to complete your exam in an adequate time.