any tips for hillclimb for MTB.  i just bought a computer bike + cadence + heart rate sensor . Newbies here.

I have had both before, still macam no difference. Pedal uphill still also very tiring LOL. I had a 28T chainring initially but I killed my crank arm which led me to change to a Shimano SLX one with a 32T (only 32T was in stock). Recently swapped back to 30T because I was having issues trying to tackle the technical uphill with 32T.

You should factor in also that you're getting fitter/stronger. There's a hill I go to every weekend, 3km with 8% gradient. My first solo non-stop attempt was 25:56. My 5th try was 19:42. Same 34t chainring. I'm now contemplating of getting a 36t for my xc hardtail before I get a proper road bike.

Assegai are good but damn they are heavy. I run a combo of Assegai front (2.5") and DHRII rear (2.3"). But now going to stick with both DHRII front and rear.

Climbing will depend mostly on the rear tyre, type of terrain and how strong your legs are.

If you put such as aggressive tyre like assegai on the rear, its great for climbing on wet/muddy trails, but not so good for dry/road climbs because of the width and rolling resistance. If you prefer this and have strong legs, then ok la.

For me I use assegai/aggressor combo. I am not a strong climber. I just want to point the bike down the trail. Assegai in front is wide and grippy, good for making sure I don't slip off roots and rocks that easily. The faster rolling aggressor in the rear helps a lot for me when climbing the tarmac because less drag and going down the trails in Kiara. One trade off of the aggressor is that I can't lock up the rear brakes when going down faster because if I do, the rear will slide all over the place.

What's your headtube angle ? 
That will affect the climbing.  Tyres ,... Don't think it is so significant.

What's your headtube angle ? 
That will affect the climbing.  Tyres ,... Don't think it is so significant.

What you using at the back?
I believe when it comes to climbing or rolling resistance, rear tyre have bigger effect.

Where you get Ikon?

Yes ikon got good rolling Liao. I remember ride with road bikers on my Mtb to klia using ikon. I can keep up with them. I loose them on the downhill and flat but catch them on the climb. My Strava shows 28kmh average which was a surprise to me with my mtb and big ass ikons