Physics Spl

Apart from MBBS, you have many other things to do like BDS, BSc Biological Science, BSc Nursing, BSc Medical Science , BSc Agriculture, BSc Forestry, BAMS BHMS.
All fields have very good scope.

Why wait for completing B Sc to do B Tech? Try JEE next year and quit B Sc, once you get a B Tech seat.

You must check your score in class x. go for science only if it is above 8.5. because science at class x and physics , chemistry at next level is quite different. i suggest you to first makeup your mind , what you want to do in future and than decide your subjects at secondary level.

BBA addmistion eligibility 12th pass and english subject minimum 45 marks.

its very tough to get into DU. getting admiited into iit is easy but in DU its impossible. according to this year cutt off the minimum percentage required is 98.5-100 %. there are various quota by which u can get admission so visit DU site and see what are the options.
best of luck.