B.Tech

1. Create a practical study plan
Students usually spend more time in planning than actually executing those plans. Planning is an art of the possible. So, create a plan which can be successfully executed. Give more time to topics which you find difficult and keep a buffer so that you can complete some pending tasks.
2. Know your strength and weakness
Everyone has specific strengths and specific weaknesses. It's pretty certain that if you are not clear on your weaknesses then you are not clear on your strengths either. Playing to your strengths and sailing through the weaknesses is the best exam strategy you can bet on.
3. Use fewer books for theory:
Students have a habit of referring innumerable books for each subject even though most of them convey the same thing. Having too many books would lead to confusion during time of revision and most of your doubts would remain unresolved without a go to book. We have compiled a list of IIT-JEE books recommended by our experts here.
4. Read the questions cautiously:
Examiners try to trap students by playing around with the question and options. So, read the question carefully to understand what is required and see the options with great concentration. Watch out for the questions which are designed to have more than one correct answer and you are supposed to choose the option with multiple correct answers.
5. Plan your exam strategy:
Planning the way you attempt various questions is quite crucial to crack the entrance exam. You do not have to approach the question paper the way it is intended to be. The important thing is not to waste time over questions which seem to be difficult. Finish off all the sections which you are really good at so that you can dedicate more time for the difficult ones.
6. Train your mind for the exam:
Your mind should be prepared to perform well during an exam. This requires consistency over a long period of time. If you are planning to give your exam in 9-12 slot, you should practice solving papers at the same time so that your mind is trained to be super active during that period.
7. Practice previous year papers:
Practicing previous year question papers should be left for the last couple of months before an exam. These are actual questions which have appeared and you should time yourself while answering them so that you can compare your scores. Also, try to attempt the test papers in the same time slot as your final exam.
8. Use our cheat-sheet to revise the formulas.

Not necessary, it is your choice. If you are interested in continuing your study to gain more knowledge then you can do B.Tech after completing your Diploma in the respective engineering branch through lateral entry to get admission in B.Tech 2nd year directly. But it is advisable to complete your Degree after Diploma. If you join a job right after your Diploma then it will be more complicated to do B.Tech if you feel it's importance later. You can get a promotion quickly in a private company if you hold the degree doing a Diploma level service. In government organisation, you can sit in the departmental examination to get promotion in a higher rank in reserve category. Salary can vary from 10,000K to 15,000K in government organisation of Diploma & degree engineer. In a private company, it's not a matter of concern.