Science

First of all, don't ignore the NCERT book. It is must to complete the NCERT. Also, you may refer to:
1) Pradeep
2) Dinesh.

You should go according to your branch of interest. You need to opt for the field in which you are mostly interested because both the colleges are very good. If you don't have any branch issue then go for IIIT-Delhi.
Best of luck.

Andhra Pradesh-EAMCET 2018 College Predictor:
Use your Andhra Pradesh-EAMCET 2018 rank to see where you can get admission at the link provided below:
See the courses, colleges & rounds you may crack.
The result is based on admissions data of Andhra Pradesh-EAMCET 2017:
Get resources and insights on coll

Delhi University is one of the best options for maths honours.
Also, you can look into:
Christ-Bangalore
St. Xavier's, Mumbai
Loyola-Chennai.

There are many courses available for you after PCB:
MBBS
BAMS
BHMS
BUMS
Bachelor of Physiotherapy
Bachelor of Veterinary Science and animal husbandry
Bachelor of neuropathy and Yogic Science
B.Sc nursing
B.Sc Agriculture
Pharmacy
Biotechnology
General nursing
B.Ed
B.Sc degree.

You can pursue the desired subject, there's no requirement of maths in it. According to the eligibility criteria, one should have science either maths, biology, or agriculture in intermediate. HSC.

B.Sc Computer Science is not equivalent to B.Tech because, in B.Tech, you study more subjects than B.Sc. But you can still get a job on what you have studied.

Hello dear,
I am attaching a link of JEE College Predictor where you can find the best college you can get through your rank in JEE:
https://www.shiksha.com/b-tech/resources/jee-mains-college-predictor?utm_source=connect&utm_medium=CR_JEECP&utm_campaign=7489993

Hello dear,
I am sharing you the link which will give you all basic idea of the exams from the eligibility, syllabus, exam date and other sorts of information. This will help you to clear all the doubts regarding your upcoming exams:
https://www.google.co.in/url?sa=t&source=web&rct=j&url=https://www.