Career

Both the fields have good options as these are evergreen fields. The development in IT and Construction will never end and these will grow more in coming time. So both are good options.

u can apply in uk.u can have Your Masters done in a particular stream in chemistry.they r very good.in india u can do M.Sc and then PhD also.

its better u don't.coz neet is a competetive xam.n therr is no gurantee that u will pass it.untill u r an outstanding student.
if u drop a year and god forbid u don't pass.then it will b the worst nightmare in Your life.
even if u want to do.the n u prepare for neet along with Your present study.risk factor will be less.coz if u don't pass Your neet.after 1 year u will have Your hons degree.so ir 2/3rd job will b already done by then.more or less m not in favour for this.better u go into research in medicine or something.that would b better

Considering today's market B.Sc. IT will land you more opportunities.
All the best.!!!

B.Sc hons can be done in physics, chemistry, bio chemistry, bioinformatics, maths, botany, zoology, Biotechnology, physiotherapy, occupational therapy etc. All subjects have their own benefits so u need to choose which u like and handle easily for next three years. Jobs will entirely depend on Your skills and abilities to utilize the subject as the job market keeps changing.