Hello aspirant,
I am here for helping you...
You are pursuing BSc first year and u want to appear for IIT exam so I am informing you that you can definitely appear for this exam and it will little bit beneficial for you because you will be studying some advanced topics in your BSc which will clear your concept for IIT exam,
This will be called as your partial drop where you will prepare for IIT along with your BSc.
but remember that for cracking IIT exam you will have to studies some other topics which will be in the syllabus of IIT because some of the topics you will not study in your BSc course but this will be for IIT syllabus.

Apart from this I want to inform you that...


Careers360 is coming up with India's Biggest Talent Search Exam-"CTSE" where aspirants of JEE and NEET 2020/21 can take the test and win prizes & scholarships worth 1.25 crores. Students studying in class 11th, 12th and 12th droppers can appear for this exam. They will get to know where they stand in terms of preparation and competition. Every student will have to pay a nominal fee of rupees 100/- and in return, he will get Paytm cashback offers worth rupees 250* and prizes include: cash, laptops, smartphones, amazon echos, Careers360 almanacs, power banks and more.

• http://bit.ly/32QjPzy
  

Don't forget to share it with your friends....

I hope it will be beneficial for you....
For more queries you can  upvote my answer and can ask in the comment section below...

• Best of luck...