Is I law with poltical science a bad choice? I changed poltical science from IR. But i don't want to change my Ilaw with constitutional law.

Anyone please!

International law and political science are like two poles that are erected at distance of three meters from each other. However, combination of both subjects are excellent. I opted this combination in ce-2020 examination. However, problem that I faced during preparation was psychological pressure. Whenever, I picked up book for comparative constitution, I felt overwhelmed by studying comparative constitution with International law. Neurons in my grey matter told me that you were wasting your precious time and energy by studying two different subjects. I thought, If I were opted constitutional law then I would be in comfortable position and took advantage of overlapping topics.I would read one topic in one subject, same topic in other subject would also cover. In this way, I could save my precious time and energy for other subjects. However, according to the scoring trend, International law is more scoring then constitutional law. It is also easy to prepare even one can prepare International law within 7 days by selecting 15 topics. On the other hand, you have to prepare many sub-topics of each constitution thoroughly with proper referencing of clauses and article. So, you can opt both subject but you would bear psychological pressure on your nerves. By the way, this combination is good. Opt it.

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“Never leave that till tomorrow which you can do today.”
Benjamin Franklin

As you said that you don't want to change, then please don't change.
It's good that you know yourself that you don't have to change I law with constitutional law. If there is any subject that you don't like,and you have no interest in it. Then believe me, there is a chance that after opting for this subject ,you will find it difficult to focus or to study etc.
People can advise you different things. But they are advising as per their knowledge. And you must believe in yourself and go on with subject that you like to opt.
I once opted British history just because people were saying that it's good , short ,high scoring. But I couldn't develop interest in it. I had to opt Islamic history, but people were saying that it's lengthy ,low scoring etc. I made that choice of taking British history just on the opinion of others. So it worked quite bad for me. Basically you have to see your interest ,aptitude and then background etc before opting any subject.

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''Sufficient for us is Allah , and He is the best Disposer of affairs" Al-Quran