Exam

Yes, you will have to pay your further fee. It's will cost you about 8 lacs for the entire course of B.Des in fashion designing. Also, you will have to spend on the material you buy.

HR and Tourism are two different domains. Yes, Tourism gives you a large scope of growth looking at the current trend. On the other hand, HR is a critical profile with the complex handling required in this digital era. Both are equally good options. HR can give you a working option in Tourism.

In which state are you looking for B.Tech?
See, try to choose the field in which you love to work and you have very much interest in it with curiosity, it will be very much beneficial to you than any other fields.

Mahesh,
First, check this out what you have scored in class 12 as from this year The Ministry of Human Resource Development, Government of India has notified following two changes in the JEE pattern for 2017:
1. There shall be no weightage for the 12th class marks in calculating the ranks in the JEE

Exams for IITs (JEE Mains and JEE Advanced) for 2017, are already finished.
If have not applied in it then try to get admission in the colleges which are giving admissions without JEE Mains.

At this percentile, it's not possible for you to get the top colleges of Pune. My suggestion to you is to prepare for the exam again and try to score good (above 80 percentile) and then take admission for MBA.